GET /kore/v1/principal/?format=api&offset=380
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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                                "begin_year": 1902,
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                                "end_month": null,
                                "end_year": 1905,
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                                "begin_month": null,
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                                            "url": "https://hkm.finna.fi/Cover/Show?id=hkm.HKMS000005%3A000000d7&w=1200&h=1200",
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                                        "url": "https://hkm.finna.fi/Cover/Show?id=hkm.HKMS000005%3A000000d7&w=1200&h=1200",
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                        "principals": [
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                                    "url": "https://api.hel.fi/kore/v1/principal/446/?format=api",
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                                    "name": "arkistoaineisto"
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                                "location": "Tuntematon",
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                                "additional_info": null
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                    "begin_day": 8,
                    "begin_month": 9,
                    "begin_year": 1899,
                    "end_day": null,
                    "end_month": null,
                    "end_year": 1905,
                    "reference": null,
                    "approx_begin": false,
                    "approx_end": false,
                    "principal": 446
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                {
                    "id": 1107,
                    "school": {
                        "url": "https://api.hel.fi/kore/v1/school/264/?format=api",
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                        "names": [
                            {
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                                "official_name": "Oikokadun ala-asteen koulu",
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                                "begin_day": 1,
                                "begin_month": 8,
                                "begin_year": 1977,
                                "end_day": null,
                                "end_month": null,
                                "end_year": 1981,
                                "reference": null,
                                "approx_begin": false,
                                "approx_end": false
                            },
                            {
                                "id": 544,
                                "official_name": "Oikokadun kansakoulu",
                                "other_names": null,
                                "begin_day": null,
                                "begin_month": null,
                                "begin_year": 1905,
                                "end_day": 31,
                                "end_month": 7,
                                "end_year": 1977,
                                "reference": null,
                                "approx_begin": false,
                                "approx_end": false
                            },
                            {
                                "id": 545,
                                "official_name": "Kruununhaan ala-asteen koulu",
                                "other_names": null,
                                "begin_day": 11,
                                "begin_month": 2,
                                "begin_year": 1981,
                                "end_day": 31,
                                "end_month": 7,
                                "end_year": 1993,
                                "reference": null,
                                "approx_begin": false,
                                "approx_end": false
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                        ],
                        "languages": [
                            {
                                "id": 196,
                                "language": "suomi",
                                "begin_year": 1905,
                                "end_year": 1993,
                                "reference": null,
                                "approx_begin": false,
                                "approx_end": false
                            },
                            {
                                "id": 446,
                                "language": "ruotsi",
                                "begin_year": 1905,
                                "end_year": 1910,
                                "reference": null,
                                "approx_begin": false,
                                "approx_end": false
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                        ],
                        "types": [
                            {
                                "id": 513,
                                "type": {
                                    "id": 1,
                                    "name": "kansakoulu",
                                    "description": "1858-1977 6 lk, maksuton perusopetusta antava koulu. Vuoden 1866 kansakouluasetuksesta lähtien kaupungeissa asuville 8–14-vuotiaille lapsille tuli tarjota perusopetusta. Kansakoulusta saattoi hakea oppikouluun ja ammattikouluun."
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                                "begin_day": null,
                                "begin_month": null,
                                "begin_year": 1905,
                                "end_day": 31,
                                "end_month": 7,
                                "end_year": 1977,
                                "reference": null,
                                "approx_begin": false,
                                "approx_end": false,
                                "main_school": 264
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                            {
                                "id": 514,
                                "type": {
                                    "id": 2,
                                    "name": "alakansakoulu",
                                    "description": "1867-1958 Kansakoulun kaksi ensimmäistä vuosiluokkaa, jossa annettiin alkeisopetusta. Vuodesta 1958 peruskoulu-uudistukseen 1977 asti kansakoulu oli yhtenäinen, eikä sitä enää jaettu ala- ja yläkansakouluun."
                                },
                                "begin_day": null,
                                "begin_month": null,
                                "begin_year": 1907,
                                "end_day": null,
                                "end_month": null,
                                "end_year": 1958,
                                "reference": null,
                                "approx_begin": false,
                                "approx_end": false,
                                "main_school": 264
                            },
                            {
                                "id": 515,
                                "type": {
                                    "id": 3,
                                    "name": "yläkansakoulu",
                                    "description": "1869-1958, 4 lk. Kansakoulun 3. - 6. luokka joissa annettiin yleisivistävää opetusta. Vuodesta 1921 lähtien yläkansakoulussa annettiin oppivelvollisuusopetusta. Vuonna 1958 erillisistä ylä- ja alakansakouluista muodostettiin yhtenäisiä kansakouluja."
                                },
                                "begin_day": null,
                                "begin_month": null,
                                "begin_year": 1910,
                                "end_day": null,
                                "end_month": null,
                                "end_year": 1958,
                                "reference": null,
                                "approx_begin": false,
                                "approx_end": false,
                                "main_school": 264
                            },
                            {
                                "id": 516,
                                "type": {
                                    "id": 4,
                                    "name": "kansalaiskoulu",
                                    "description": "1958-1977 2lk, kansakoulun jälkeinen koulu, jossa keskityttiin ammatilliseen esivalmennukseen ja asuinseudun elinkeinoelämään tutustumiseen. Aiemmin tehtävää hoitivat jatkokoulut. Peruskoulu-uudistuksessa kansalaiskoulut muutettiin yläasteiksi."
                                },
                                "begin_day": null,
                                "begin_month": null,
                                "begin_year": 1959,
                                "end_day": null,
                                "end_month": null,
                                "end_year": 1962,
                                "reference": null,
                                "approx_begin": false,
                                "approx_end": false,
                                "main_school": 264
                            },
                            {
                                "id": 517,
                                "type": {
                                    "id": 8,
                                    "name": "ala-aste",
                                    "description": "1977-1999 Peruskoulun 1-6 vuosiluokka. 1999 lähtien peruskoulussa ei ole ollut jakoa ala- ja yläasteeseen. Vuodesta 1999 lähtien virallinen termi on ollut alakoulu, mutta myös muotoa peruskoulun ala-asteen koulu käytetään."
                                },
                                "begin_day": 1,
                                "begin_month": 8,
                                "begin_year": 1977,
                                "end_day": 31,
                                "end_month": 7,
                                "end_year": 1993,
                                "reference": null,
                                "approx_begin": false,
                                "approx_end": false,
                                "main_school": 264
                            },
                            {
                                "id": 518,
                                "type": {
                                    "id": 12,
                                    "name": "valmistava koulu",
                                    "description": "1870- 1977 Yksityinen kansakoulun alimpien luokkien kanssa rinnakkainen koulu, josta pyrittiin oppikouluun. Valmistavat koulut olivat usein pieniä ja eniten niitä oli Helsingissä 1900-luvun alkuvuosikymmeninä."
                                },
                                "begin_day": null,
                                "begin_month": null,
                                "begin_year": 1910,
                                "end_day": null,
                                "end_month": null,
                                "end_year": 1921,
                                "reference": null,
                                "approx_begin": false,
                                "approx_end": false,
                                "main_school": 264
                            },
                            {
                                "id": 519,
                                "type": {
                                    "id": 13,
                                    "name": "jatkokoulu",
                                    "description": "1882-1958 2lk  Oppilaitos kansakoulun käyneille, jotka eivät jatkaneet opintojaan. Vuoden 1921 oppivelvollisuuslaista lähtien pakollinen. Opetus tähtäsi kansakoulukurssin syventämiseen sekä sisälsi käytännöllisammatillista opetusta. Ks. Kansalaiskoulu"
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                                "begin_day": null,
                                "begin_month": null,
                                "begin_year": 1905,
                                "end_day": null,
                                "end_month": null,
                                "end_year": 1924,
                                "reference": null,
                                "approx_begin": false,
                                "approx_end": false,
                                "main_school": 264
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                            {
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                                "type": {
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                                    "name": "iltakoulu",
                                    "description": "Kansakoulu, oppikoulu tai ammattikoulu, jossa opetus tapahtui iltaisin. Iltakoulut olivat tarkoitettu sellaisille henkilöille, jotka eivät päivätyönsä vuoksi pystyneet osallistumaan päivällä tapahtuvaan opetukseen."
                                },
                                "begin_day": null,
                                "begin_month": null,
                                "begin_year": 1919,
                                "end_day": null,
                                "end_month": null,
                                "end_year": 1923,
                                "reference": null,
                                "approx_begin": false,
                                "approx_end": false,
                                "main_school": 264
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                            {
                                "id": 521,
                                "type": {
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                                    "name": "apukoulu",
                                    "description": "1903-1970, Kansakoululaitoksen osana toimiva koulu, joka oli tarkoitettu oppilaille, jotka eivät  oppimisvaikeuksien tai erityisen tuen tarpeen vuoksi pärjänneet yleisessä kansakoulussa. Ks. Erityiskoulu."
                                },
                                "begin_day": null,
                                "begin_month": null,
                                "begin_year": 1905,
                                "end_day": null,
                                "end_month": null,
                                "end_year": 1910,
                                "reference": null,
                                "approx_begin": false,
                                "approx_end": false,
                                "main_school": 264
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                        "fields": [],
                        "genders": [
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                                "id": 181,
                                "gender": "tyttö- ja poikakoulu",
                                "begin_day": null,
                                "begin_month": null,
                                "begin_year": 1905,
                                "end_day": 31,
                                "end_month": 7,
                                "end_year": 1993,
                                "reference": null,
                                "approx_begin": false,
                                "approx_end": false
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                        "grade_counts": [
                            {
                                "id": 213,
                                "number": 2,
                                "begin_day": null,
                                "begin_month": null,
                                "begin_year": 1962,
                                "end_day": 31,
                                "end_month": 7,
                                "end_year": 1993,
                                "reference": null,
                                "approx_begin": false,
                                "approx_end": false
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                            {
                                "id": 352,
                                "number": 2,
                                "begin_day": null,
                                "begin_month": null,
                                "begin_year": 1905,
                                "end_day": null,
                                "end_month": null,
                                "end_year": 1907,
                                "reference": null,
                                "approx_begin": false,
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                            {
                                "id": 353,
                                "number": 4,
                                "begin_day": null,
                                "begin_month": null,
                                "begin_year": 1907,
                                "end_day": null,
                                "end_month": null,
                                "end_year": 1910,
                                "reference": null,
                                "approx_begin": false,
                                "approx_end": false
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                            {
                                "id": 420,
                                "number": 8,
                                "begin_day": null,
                                "begin_month": null,
                                "begin_year": 1910,
                                "end_day": null,
                                "end_month": null,
                                "end_year": 1962,
                                "reference": null,
                                "approx_begin": false,
                                "approx_end": false
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                        "buildings": [
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                                "id": "264-76",
                                "building": {
                                    "url": "https://api.hel.fi/kore/v1/building/76/?format=api",
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                                                "type": "Point"
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                                            "street_name_fi": "Snellmaninkatu 18",
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                                            "comment": "ent. Nikolainkatu 18",
                                            "approx_begin": false,
                                            "approx_end": false
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                                        {
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                                                "type": "Point"
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                                            "street_name_fi": "Nikolainkatu 18",
                                            "street_name_sv": "Nikolaigatan 18",
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                                            "municipality_fi": "Helsinki",
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                                            "begin_month": null,
                                            "begin_year": 1909,
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                                            "comment": "nyk. Snellmaninkatu 18",
                                            "approx_begin": false,
                                            "approx_end": false
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                                    ],
                                    "construction_year": 1899,
                                    "architect": "Onni Tarjanne",
                                    "architect_firm": null,
                                    "property_number": null,
                                    "sliced": false,
                                    "comment": "Kruununhaan ylä-aste, folkskola",
                                    "reference": "Opintiellä",
                                    "approx": false,
                                    "owners": [
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                                            "owner": {
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                                                "type": "kunta",
                                                "name": "Helsingin kaupunki"
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                                            "begin_month": null,
                                            "begin_year": 1899,
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                                            "end_month": null,
                                            "end_year": null,
                                            "reference": null,
                                            "approx_begin": false,
                                            "approx_end": false
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