{ "spec_version": "5", "endpoint": "history", "stock_code": "6809", "company_name": "ＴＯＡ", "content_lang": "ja", "meta_lang": "en", "canonical_url": "https://the-shashi.com/tse/6809/decisions/", "api_url": "/api/6809/history.json", "updated": "2026-10-27", "license": "© 2026 Yutaka Sugiura. All rights reserved.", "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/6809/decisions/", "source": { "long_term": { "primary": [ "有価証券報告書" ], "extraction": "EDINET の XBRL、旧有価証券報告書、会社年鑑・社史等からの転記", "row_field": "reference", "caveat": "創業期から現在までを 1 本に繋いだ長期系列のため、年代により出所・単位・連結範囲が変わる。行ごとの reference / unit / consolidation を必ず参照すること" } }, "title": "ＴＯＡの歴史概略", "eras": [ { "title": "東亞特殊電機製作所の創業と拡声機器の製造販売", "start_year": 1934, "end_year": 1957, "phase": "founding" }, { "title": "東亞商事の吸収合併と医用電子機器部門の譲渡", "start_year": 1958, "end_year": 1976, "phase": "transformation" }, { "title": "大証上場とTOAへの商号変更", "start_year": 1977, "end_year": 2008, "phase": "growth" }, { "title": "南アフリカ・タイの販売合弁とPA-Vox Holdingの買収", "start_year": 2009, "end_year": 2026, "phase": "maturity" } ], "long_term": [ { "year": 1950, "month": 3, "company_name": "6809", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": 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