K.K. Takasago Shōkai (㈱高砂商会) was a Japanese distributor in Ginza, Tokyo, in the 1950s. The company distributed the Sanon Six folders (made by Tōsei Kōki) and the Comex 35 viewfinder camera, originally called Sanon 35. It also announced the Sanonflex TLR.
- 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.