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Hideyoshi Sangyō (秀好産業) was a Japanese company active in 1959, which distributed the Septon Pen, a combination of a subminiature camera and a propelling pencil.
- ↑ Advertisement in Sankei Camera August 1959, reproduced in Kokusan kamera no rekishi, p.253.
- Asahi Camera (アサヒカメラ) editorial staff. Shōwa 10–40nen kōkoku ni miru kokusan kamera no rekishi (昭和10–40年広告にみる国産カメラの歴史, Japanese camera history as seen in advertisements, 1935–1965). Tokyo: Asahi Shinbunsha, 1994. ISBN 4-02-330312-7.