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  "company_name": "共立メンテナンス",
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  "license": "© 2026 Yutaka Sugiura. All rights reserved.",
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      "有価証券報告書"
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    "extraction": "有価証券報告書の沿革を基礎に、社史・報道で補完",
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      "date": "1979/9",
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      "event": "東京都葛飾区で共立メンテナンスを設立",
      "source": "有価証券報告書"
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      "importance": 2,
      "event": "受託給食事業を開始",
      "source": "有価証券報告書"
    },
    {
      "date": "1980/4",
      "importance": 3,
      "event": "学生寮事業を開始",
      "source": "有価証券報告書"
    },
    {
      "date": "1982/7",
      "importance": 1,
      "event": "本社を東京都千代田区淡路町に移転",
      "source": "有価証券報告書"
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      "date": "1984/4",
      "importance": 2,
      "event": "受託寮事業を開始",
      "source": "有価証券報告書"
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    {
      "date": "1985/4",
      "importance": 2,
      "event": "社員寮事業を開始",
      "source": "有価証券報告書"
    },
    {
      "date": "1985/9",
      "importance": 1,
      "event": "大阪支店（現・関西支店）を設置",
      "source": "有価証券報告書"
    },
    {
      "date": "1987/5",
      "importance": 2,
      "event": "外食事業を開始",
      "source": "有価証券報告書"
    },
    {
      "date": "1990/10",
      "importance": 2,
      "event": "サン・エンタープライズ（現・共立エステート）の株式を100%取得",
      "source": "有価証券報告書"
    },
    {
      "date": "1993/7",
      "importance": 2,
      "event": "リゾートホテル事業を開始",
      "source": "有価証券報告書"
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    {
      "date": "1993/8",
      "importance": 3,
      "event": "ビジネスホテル「ドーミーイン」事業を開始",
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      "date": "1994/9",
      "importance": 1,
      "event": "日本証券業協会に株式を店頭登録",
      "source": "有価証券報告書"
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      "importance": 2,
      "event": "シニアライフ事業を開始",
      "source": "有価証券報告書"
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    {
      "date": "1999/3",
      "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"
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      "date": "2001/9",
      "importance": 1,
      "event": "東京証券取引所市場第一部に指定替え",
      "source": "有価証券報告書"
    },
    {
      "date": "2010/5",
      "importance": 2,
      "event": "PKP事業（地方自治体向け業務受託事業）を開始",
      "source": "有価証券報告書"
    },
    {
      "date": "2011/7",
      "importance": 1,
      "event": "韓国共立メンテナンスを設立",
      "source": "有価証券報告書"
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    {
      "date": "2017/4",
      "importance": 1,
      "event": "Kyoritsu Maintenance (Thailand) Co., Ltd.を設立",
      "source": "有価証券報告書"
    },
    {
      "date": "2022/4",
      "importance": 1,
      "event": "東京証券取引所プライム市場に移行",
      "source": "有価証券報告書"
    },
    {
      "date": "2024/2",
      "importance": 3,
      "event": "コスモスイニシア（現・持分法適用関連会社）の株式を一部取得",
      "source": "有価証券報告書"
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