Tōhōkōken was perhaps a Japanese company in the first half of the 1950s. The engraving Tōhōkōken camera is found on the top housing of the Camel, a 35mm viewfinder camera. Sugiyama and McKeown attribute the Camel and the Kikuca 35 (a rangefinder derivative) to "Tohokoken Camera Co." or "Tohokoken Camera Works".
"Kōken" is probably written 光研, an abbreviation of kōgaku kenkyū meaning "optical research".
- McKeown, James M. and Joan C. McKeown's Price Guide to Antique and Classic Cameras, 12th Edition, 2005-2006. USA, Centennial Photo Service, 2004. ISBN 0-931838-40-1 (hardcover). ISBN 0-931838-41-X (softcover).
- Sugiyama, Kōichi (杉山浩一); Naoi, Hiroaki (直井浩明); Bullock, John R. The Collector's Guide to Japanese Cameras. 国産カメラ図鑑 (Kokusan kamera zukan). Tokyo: Asahi Sonorama, 1985. ISBN 4-257-03187-5.