Maruzen K.K. (丸善㈱) is a Japanese bookshop, founded in 1869, whose headquarters and main shop are in Nihonbashi, Tokyo. It seems that the company also sold cameras, at least in the early postwar period, and it has been mentioned as one of the distributors of the Bikor-Flex.
- Kitano Kunio (北野邦雄). "Mittsu no kokusan ōtomāto" (三つの国産オートマート, Three Japanese Automat). In Kohga Gekkan vol.8 no.6, June 1949. Pp.48–53.