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Ogasawara Kōgaku (小笠原光学) was a Japanese company based in Tokyo, Adachi in 1943. It is mentioned in the April 1943 government inquiry as the maker of the Mizuho 75/4.5 lens of the Mizuho and of the Hokoku 75/4.5 lens of the Hokoku, both with three elements.
- ↑ Its address in 1943 was Tōkyō-to Adachi-ku Umeda-machi 7807 (東京都足立区梅田町7807). Source: "Kokusan shashinki no genjōchōsa" ("Inquiry into Japanese cameras"), listing the Japanese camera production as of April 1943.
- ↑ "Kokusan shashinki no genjōchōsa" ("Inquiry into Japanese cameras"), lens items Lc15 and Lc16.
- "Kokusan shashinki no genjōchōsa" (国産写真機ノ現状調査, Inquiry into Japanese cameras), listing Japanese camera production as of April 1943. Reproduced in Supuringu kamera de ikou: Zen 69 kishu no shōkai to tsukaikata (スプリングカメラでいこう: 全69機種の紹介と使い方, Let's try spring cameras: Presentation and use of 69 machines). Tokyo: Shashinkogyo Syuppan-sha, 2004. ISBN 4-87956-072-3. Pp.180–7.