{
  "spec_version": "3",
  "endpoint": "timeline",
  "stock_code": "6136",
  "company_name": "OSG",
  "content_lang": "ja",
  "meta_lang": "en",
  "canonical_url": "https://the-shashi.com/tse/6136/",
  "api_url": "/api/6136/timeline.json",
  "updated": "2026-08-14",
  "license": "© 2026 Yutaka Sugiura. All rights reserved.",
  "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/6136/",
  "source": {
    "primary": [
      "有価証券報告書（沿革）"
    ],
    "extraction": "有価証券報告書の沿革を基礎に、社史・報道で補完",
    "row_field": "source"
  },
  "timeline": [
    {
      "date": "1938/3",
      "importance": 3,
      "event": "東京府に大沢螺子研削所を創立。タップ・ダイスの製造販売を開始",
      "source": null
    },
    {
      "date": "1942/5",
      "importance": 2,
      "event": "溝淵製作所を買収合併。ねじゲージの製造を開始",
      "source": null
    },
    {
      "date": "1943/5",
      "importance": 1,
      "event": "愛知工場を建設",
      "source": null
    },
    {
      "date": "1945/8",
      "importance": 2,
      "event": "終戦により全工場を閉鎖",
      "source": null
    },
    {
      "date": "1946/5",
      "importance": 2,
      "event": "本社を東京都杉並区に移転。愛知工場の操業を再開",
      "source": null
    },
    {
      "date": "1955/4",
      "importance": 2,
      "event": "本社を愛知県宝飯郡一宮村に移転",
      "source": null
    },
    {
      "date": "1961/4",
      "importance": 1,
      "event": "豊川工場を新設",
      "source": null
    },
    {
      "date": "1963/5",
      "importance": 1,
      "event": "ねじ転造平ダイスの製造を開始",
      "source": null
    },
    {
      "date": "1963/6",
      "importance": 2,
      "event": "社名をオーエスジーに変更",
      "source": null
    },
    {
      "date": "1964/12",
      "importance": 1,
      "event": "名古屋証券取引所市場第二部に上場",
      "source": null
    },
    {
      "date": "1967/3",
      "importance": 1,
      "event": "大池工場を新設",
      "source": null
    },
    {
      "date": "1968/2",
      "importance": 3,
      "event": "米国にOSG Tap and Die, Inc.を設立",
      "source": null
    },
    {
      "date": "1970/5",
      "importance": 1,
      "event": "台湾に大宝精密工具股份有限公司を設立",
      "source": null
    },
    {
      "date": "1970/10",
      "importance": 3,
      "event": "ハイスエンドミルの製造を開始",
      "source": null
    },
    {
      "date": "1970/12",
      "importance": 1,
      "event": "東京証券取引所市場第二部に上場",
      "source": null
    },
    {
      "date": "1971/12",
      "importance": 1,
      "event": "豊橋工場を新設",
      "source": null
    },
    {
      "date": "1974/11",
      "importance": 1,
      "event": "ブラジルに工具メーカーOSG Ferramentas de Precisão Ltda.を設立",
      "source": null
    },
    {
      "date": "1980/9",
      "importance": 2,
      "event": "超硬エンドミルの製造を開始",
      "source": null
    },
    {
      "date": "1981/6",
      "importance": 1,
      "event": "東京証券取引所および名古屋証券取引所の市場第一部に上場",
      "source": null
    },
    {
      "date": "1982/2",
      "importance": 1,
      "event": "新城工場を新設",
      "source": null
    },
    {
      "date": "1984/3",
      "importance": 2,
      "event": "ドリルの製造を開始",
      "source": null
    },
    {
      "date": "1990/11",
      "importance": 2,
      "event": "八名工場が完成。タップの集中生産を確立",
      "source": null
    },
    {
      "date": "1992/12",
      "importance": 1,
      "event": "オーエスジー販売と合併",
      "source": null
    },
    {
      "date": "1994/1",
      "importance": 1,
      "event": "メキシコのタップメーカーHerramientas Metalicas de Corte, S.A. de C.V.を買収",
      "source": null
    },
    {
      "date": "1997/10",
      "importance": 1,
      "event": "中国に切削工具製造会社の大宝(東莞)模具切削工具有限公司を設立",
      "source": null
    },
    {
      "date": "2004/6",
      "importance": 1,
      "event": "中国に超硬切削工具製造会社の奥斯机(上海)精密工具有限公司を設立",
      "source": null
    },
    {
      "date": "2006/7",
      "importance": 3,
      "event": "タンガロイと資本・業務提携契約を締結",
      "source": null
    },
    {
      "date": "2008/9",
      "importance": 2,
      "event": "タンガロイとの資本・業務提携契約を解消。新たな業務提携契約を締結",
      "source": null
    },
    {
      "date": "2015/9",
      "importance": 1,
      "event": "フランスのDESGRANGES HOLDING S.A.S.を買収",
      "source": null
    },
    {
      "date": "2016/3",
      "importance": 1,
      "event": "米国のAmamco Tool & Supply Co., Inc.を買収",
      "source": null
    },
    {
      "date": "2016/11",
      "importance": 1,
      "event": "南アフリカのSomta Tools (Pty) Ltdを買収",
      "source": null
    },
    {
      "date": "2019/12",
      "importance": 1,
      "event": "ドイツのSL Holding GmbHを買収",
      "source": null
    },
    {
      "date": "2022/4",
      "importance": 1,
      "event": "東京証券取引所プライム市場および名古屋証券取引所プレミア市場に移行",
      "source": null
    },
    {
      "date": "2024/7",
      "importance": 1,
      "event": "オランダのPrecision Tools Holding B.V.を買収",
      "source": null
    }
  ]
}