Firstflex
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Among other TLR and SLR products, Firstflex seem to have made the Firstflex 35 SLR - the later models of which used the mirror as a shutter.
Bibliography
- Watakushi no ni-gan-refu kamera-ten (私の二眼レフカメラ展, Exhibition of twin lens reflex cameras). Tokyo: JCII Camera Museum, 1992. (Exhibition catalogue, no ISBN number.) P. 27.