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      "date": "1971/3",
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      "event": "保志忠彦氏が保志商店を創業",
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      "event": "第一興商に商号変更",
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    {
      "date": "1976/2",
      "importance": 3,
      "event": "業務用カラオケ事業に参入",
      "source": "有価証券報告書"
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    {
      "date": "1976/5",
      "importance": 2,
      "event": "8トラックカラオケ「プレイサウンドTD-201」を発売",
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      "date": "1982/6",
      "importance": 1,
      "event": "本社を移転",
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    {
      "date": "1983/5",
      "importance": 2,
      "event": "レーザーディスクカラオケ「LD-V10」を発売",
      "source": "有価証券報告書"
    },
    {
      "date": "1983/10",
      "importance": 1,
      "event": "コンパクトディスクカラオケ「CDK-4000」を発売",
      "source": "有価証券報告書"
    },
    {
      "date": "1988/9",
      "importance": 3,
      "event": "カラオケルーム1号店「ビッグエコー二又瀬店」を出店",
      "source": "有価証券報告書"
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    {
      "date": "1992/9",
      "importance": 1,
      "event": "圧縮動画方式カラオケ「DVK-2000」を発売",
      "source": "有価証券報告書"
    },
    {
      "date": "1994/4",
      "importance": 3,
      "event": "通信カラオケ「DAM-6400」を発売",
      "source": "有価証券報告書"
    },
    {
      "date": "1995/9",
      "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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      "event": "放送事業に参入",
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    {
      "date": "2000/3",
      "importance": 1,
      "event": "携帯電話向け着信メロディサービスを開始",
      "source": "有価証券報告書"
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    {
      "date": "2000/6",
      "importance": 1,
      "event": "ストリーミングカラオケ「カラオケ@DAM」を開始",
      "source": "有価証券報告書"
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      "date": "2001/2",
      "importance": 1,
      "event": "「DKエルダーシステム」を発売",
      "source": "有価証券報告書"
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      "date": "2001/7",
      "importance": 3,
      "event": "日本クラウンを子会社化",
      "source": "有価証券報告書"
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      "date": "2001/10",
      "importance": 2,
      "event": "徳間ジャパンコミュニケーションズを完全子会社化",
      "source": "有価証券報告書"
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    {
      "date": "2003/10",
      "importance": 1,
      "event": "トライエムを完全子会社化",
      "source": "有価証券報告書"
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    {
      "date": "2004/12",
      "importance": 1,
      "event": "ジャスダック証券取引所に上場",
      "source": "有価証券報告書"
    },
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      "date": "2008/12",
      "importance": 1,
      "event": "カラオケユーザーコミュニティ「DAM★とも」を開始",
      "source": "有価証券報告書"
    },
    {
      "date": "2010/4",
      "importance": 1,
      "event": "大阪証券取引所JASDAQに上場",
      "source": "有価証券報告書"
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    {
      "date": "2010/6",
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      "event": "ベスタ・フーズを完全子会社化",
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    {
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      "importance": 1,
      "event": "東京証券取引所JASDAQに上場",
      "source": "有価証券報告書"
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    {
      "date": "2014/2",
      "importance": 1,
      "event": "アドバンとゴールドを完全子会社化",
      "source": "有価証券報告書"
    },
    {
      "date": "2015/12",
      "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"
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    {
      "date": "2017/6",
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      "event": "Airsideを完全子会社化",
      "source": "有価証券報告書"
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    {
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      "event": "プライム市場に移行",
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      "date": "2024/2",
      "importance": 1,
      "event": "クレストを完全子会社化",
      "source": "有価証券報告書"
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