The name Minica OL appears on the Mini, a Japanese subminiature camera perhaps made in the late 1940s or early 1950s. This is supposed to be the name of its manufacturer, and "OL" might stand for Optical Laboratory. Nothing else is known about this company.
- Pritchard, Michael and St. Denny, Douglas. Spy Cameras — A century of detective and subminiature cameras. London: Classic Collection Publications, 1993. ISBN 1-874485-00-3. P.72.
- 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. Item 5068.
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