Category:KOYO KTR-1770 Multiband Receiver (1970)
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References[edit]
- 光洋電子工業５０年史 (Koyo Electronics Industries' Fifty Years History) (in Japanese), Koyo Electronics Industries, 2009
- "製品の歴史 / 音響機器 (History of products / audio equipment)" in above book, "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)"
- these are found on: Ken-ichi Arai (2014-01-30-). KOYO ラジオ/ (blog). ケンイチ “脳出血との闘い” (blog.livedoor.jp). "2014-09-13 ... この度、inさんから送って頂いた「光洋電子工業５０年史」から撮り、添付 しました４枚の写真を見て下さい。..."
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