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Koyo Electronics (Kōyō Denki) and its subsidiary Koyo Electronics Industry (Kōyō Denshi Kōgyō), often collectively referred to as just Koyo, are the Japanese electronics companies based in Kodaira, Tokyo〔 (【引用サイトリンク】 url = http://www.radiomuseum.org/dsp_hersteller_detail.cfm?company_id=5633 ) 〕 that manufactured radios since 1955 until 1973, and now its subsidiary manufactures industrial electronics devices and factory automation control systems.〔 〕 Their first product was a vacuum tube radio released in 1955,〔, (English translation: "''1955: 4-tube radio, model unknown''")〕 and their first transistor radio was the KR-6TS-1 radio released in the spring of 1957〔,〕 at the price of 14,000 yen.〔 〕 Through the 1960s, Koyo had manufactured and sold millions of portable transistor radios, particularly, their best-selling model KTR-624 had been shipped over one million units in ten years since its release in 1961.〔, (English translation: "''1961: 6-transistor radio, KTR-624 (Best-selling model shipped over one million units)''")〕〔, (English translation: "''KTR-624: 6-transistor radio sold over one million units until 1970, called roku-nii-yon (six-two-four), ...''")〕 Their several models had been sold under other brands, and also supplied to other manufacturers including Philco, Grundig, etc.〔, (English translation: "''1962: 8-transistor radio, 8J21P/KTR-837 (sold under both Philco and Koyo to ensure stable production volume)''")〕 However, in the August 1973, they ceased manufacture of audio products including radio receivers and record players.〔, (English translation: "''Audio products such as transistor radios and record players were manufactured since 1955 until 1973, and built the foundation of our company.''")〕 ==Gallery== File:Vintage Eldorado 6-Transistor Radio, Model 6TS2, Made in Japan, Same Radio as the Koyo KR 6TS2 (12093823464).jpg|Koyo KR-6TS-2 (1959) under Eldorado brand File:Vintage TMK 10-Transistor AM Radio (No Model Number), Reverse Paint Sliderule Dial, Made in Japan (8507489229).jpg|Koyo KTR-624 (1961)〔〔 under TMK brand (Toyomenka America) File:Vintage Grundig Multi-Band Radio, Model TR-807. 11 Bands, Made In Japan (13254538374).jpg|Koyo KTR-1770 (1970) 11-Band Radio〔, "''1970: 9石超トランジスタラジオ, KTR-1770 ④(11バンドの当社最高級機種)''"〕 sold as Grundig TR-807 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Koyo Electronics Corporation Limited」の詳細全文を読む スポンサード リンク
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