The Yokusanflex (ヨクサンフレックス) is only known through a brief mention in an article by Tanaka about the Ricohflex and Ricohflex B wartime TLRs. It seems that the name Yokusanflex was listed among other 6×6 TLRs in an official price list dated 1941. Nothing else is known about this camera, no surviving example is known and no picture has been observed so far.
- Tanaka Masao (田中政雄). "Senzen no kamera 3: Nigan-refu kamera" (戦前のカメラ3・二眼レフカメラ, Prewar cameras 3: TLR cameras). Kamera Rebyū: Kurashikku Kamera Senka (カメラレビュー クラシックカメラ専科) / Camera Review: All about Historical Cameras no.14, October 1989. No ISBN number. Rikō kamera no subete (リコーカメラのすべて, special issue on Ricoh). Pp.19–20.