Ugajin Denki Kōgaku K.K. (宇賀神電気光学㈱) was a Japanese company active in the late 1940s and based in Azabu, Tokyo. It advertised the Maruso Camera pseudo TLR using no-need-darkroom film stock, which was also advertised by Marusō Kōgaku. It is not known which of these two companies, if any, actually manufactured the camera.
- Its address was Tōkyō-to Minato-ku Azabu Shinbori-chō 4 (東京都台東区浅草新堀町四). Source: advertisement on p.6 of Nihon Shashin Kōgyō Tsūshin April 20, 1948, reproduced on p.84 of Hyaku-gō goto jūkai no kiroku.
- Nihon Shashin Kōgyō Tsūshin (日本写真興業通信). Hyaku-gō goto jūkai no kiroku (百号ごと十回の記録, Ten records, every hundred issues). Tokyo: Nihon Shashin Kōgyō Tsūshin Sha (日本写真興業通信社), 1967. No ISBN number. Advertisement on p.84, corresponding to p.6 of the April 20, 1948 issue.