{
  "spec_version": "3",
  "endpoint": "timeline",
  "stock_code": "1941",
  "company_name": "中電工",
  "content_lang": "ja",
  "meta_lang": "en",
  "canonical_url": "https://the-shashi.com/tse/1941/",
  "api_url": "/api/1941/timeline.json",
  "updated": "2026-08-15",
  "license": "© 2026 Yutaka Sugiura. All rights reserved.",
  "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/1941/",
  "source": {
    "primary": [
      "有価証券報告書",
      "公式サイト 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": "1944/9",
      "importance": 3,
      "event": "軍需省の要請で中国５県下の電気工事12社が統合した中国電気工事を広島市に設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1949/6",
      "importance": 1,
      "event": "広島証券取引所市場に上場",
      "source": "有価証券報告書"
    },
    {
      "date": "1950/1",
      "importance": 1,
      "event": "東京事務所（現 東京本部）を開設",
      "source": "有価証券報告書"
    },
    {
      "date": "1951/4",
      "importance": 2,
      "event": "送電線・発変電所工事を担う建設部（現 電力建設所）を開設",
      "source": "公式サイト 沿革"
    },
    {
      "date": "1956/11",
      "importance": 2,
      "event": "ビニール外装ケーブル工法を開発",
      "source": "有価証券報告書"
    },
    {
      "date": "1957/9",
      "importance": 1,
      "event": "中国電材を設立",
      "source": "公式サイト 沿革"
    },
    {
      "date": "1960/4",
      "importance": 2,
      "event": "技能者養成所（現 研修所）を開設",
      "source": "公式サイト 沿革"
    },
    {
      "date": "1967/4",
      "importance": 1,
      "event": "三親電材の株式を取得",
      "source": "有価証券報告書"
    },
    {
      "date": "1968/10",
      "importance": 1,
      "event": "大阪証券取引所市場第二部に上場",
      "source": "有価証券報告書"
    },
    {
      "date": "1970/11",
      "importance": 1,
      "event": "東京証券取引所市場第二部に上場",
      "source": "有価証券報告書"
    },
    {
      "date": "1972/2",
      "importance": 1,
      "event": "東京証券取引所市場第一部・大阪証券取引所市場第一部に指定",
      "source": "有価証券報告書"
    },
    {
      "date": "1990/10",
      "importance": 3,
      "event": "商号を中電工に変更",
      "source": "有価証券報告書"
    },
    {
      "date": "2003/11",
      "importance": 1,
      "event": "大阪証券取引所への上場を廃止",
      "source": "有価証券報告書"
    },
    {
      "date": "2010/12",
      "importance": 1,
      "event": "CHUDENKO(MALAYSIA)SDN. BHD.を設立",
      "source": "有価証券報告書"
    },
    {
      "date": "2015/11",
      "importance": 2,
      "event": "農業に参入する中電工ワールドファームを設立",
      "source": "公式サイト 沿革"
    },
    {
      "date": "2016/8",
      "importance": 3,
      "event": "杉山管工設備の株式を取得し管工事に領域を拡大",
      "source": "有価証券報告書"
    },
    {
      "date": "2016/9",
      "importance": 2,
      "event": "早水電機工業の株式を取得",
      "source": "有価証券報告書"
    },
    {
      "date": "2017/10",
      "importance": 1,
      "event": "RYB ENGINEERING PTE LTDの株式を取得",
      "source": "有価証券報告書"
    },
    {
      "date": "2020/3",
      "importance": 2,
      "event": "昭和コーポレーションの株式を取得",
      "source": "有価証券報告書"
    },
    {
      "date": "2022/4",
      "importance": 1,
      "event": "東京証券取引所の市場区分の見直しによりプライム市場に移行",
      "source": "有価証券報告書"
    },
    {
      "date": "2023/6",
      "importance": 1,
      "event": "監査役会設置会社から監査等委員会設置会社に移行",
      "source": "有価証券報告書"
    }
  ]
}