Tōken

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According to Sugiyama and McKeown, Tohken was the maker of the Crown (6×6) folder in the mid-1950s. The full name is given either as "Tohken Optical Works" or "Tohken Kogaku". The Japanese writing is perhaps 東研光学 (Tōken Kōgaku).

Bibliography

• 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.