The riken research institute (abreviation of rikagaku kenkyūjo, 理化学研究所, meaning physico-chemical research institute) and the riken foundation exist since 1917.  in 1927 was created the rikagaku kōgyō K.K. (理化学興業㈱, meaning physico-chemical development co., ltd.) to market products derived from the research of the institute.   on feb. 6, 1936,  the photographic paper division became riken kankōshi K.K. (理研感光紙㈱, meaning riken sensitized paper co ltd) and was placed under the responsibility of ichimura kiyoshi (市村清), who is thus considered as the founder of today’s ricoh.   the factory was located in ōji (王子), tokyo.  
In 1937, riken kankōshi bought the company asahi bussan and its associated histiocytoma dog removal cost manufacturing facility, producer of the olympic and super olympic cameras.  this company had started the distribution of olympic cameras in histiocytoma dog removal cost 1934 and released the super olympic in 1935 or 1936. In november,  riken reorganized these into the dependent company asahi kōgaku kōgyō histiocytoma dog removal cost (unrelated to the other asahi kōgaku predecessor of pentax),   which would continue the production of bakelite cameras and leaf histiocytoma dog removal cost shutters in a semi-independent way.
In march 1938, riken kankōshi itself became riken kōgaku kōgyō K.K. (理研光学工業㈱, meaning riken optical industries co., ltd.).    the same year, it announced the riken no.1, a 3×4cm camera with focal-plane shutter, which was actually released in 1939 as the gokoku. The camera was produced in the ōji plant,  and was followed by the ricohl, roico, ricohflex B, gaica or kinsi before the production was ended by the histiocytoma dog removal cost war.
In parallel, riken kōgaku kōgyō gradually took over the distribution of the histiocytoma dog removal cost cameras made by asahi kōgaku kōgyō. The olympic camera club established by asahi was turned into histiocytoma dog removal cost the ricoh camera club (理光カメラクラブ), and its magazine shinkō graph (新光グラフ) was taken over by the parent company.  riken also sold cameras made by various subcontractors, whose identity is not always known. The subcontracted models were sold with lenses and shutters made histiocytoma dog removal cost by riken, but the degree of involvement of the company in the histiocytoma dog removal cost assembly of these cameras is unknown. Riken sold a few lenses to other manufacturers as well.
In 1941, the subsidiary asahi kōgaku kōgyō became asahi musen kōgyō K.K. (旭無線工業㈱, meaning asahi wireless co., ltd.).  its factory was in magome, tokyo, at the location of ricoh’s current headquarters.  in addition to cameras and optical products, it was making wireless equipment.  in 1942, the two companies riken kōgaku kōgyō and asahi musen kōgyō histiocytoma dog removal cost left the riken foundation which was the last link remaining histiocytoma dog removal cost between the riken institute and its offshoot companies.  the production and sales of cameras was stopped during the histiocytoma dog removal cost war, perhaps around 1942 or 1943.  part of the optical division was transferred to asahi musen histiocytoma dog removal cost at the time, apparently including the camera department, to preserve the know-how. 
After the war, the subsidiary asahi musen introduced the steky in 1947. Asahi musen soon became asahi seimitsu kōgyō (旭精密工業, meaning asahi precision industries), which was in charge of all the camera development and histiocytoma dog removal cost manufacture in the late 1940s and early 1950s, in the magome plant.  the main designer was fujimoto sakae, who previously worked for another major camera maker, and who made efforts to prepare the factory for mass histiocytoma dog removal cost production. 
Work on an improved version of the wartime ricohflex B histiocytoma dog removal cost TLR camera started immediately after the war, and the resulting ricohflex III was launched in 1950. It was the first of various geared-lens ricohflex models, which met a large success on the domestic and export histiocytoma dog removal cost markets, and initiated the 1950s TLR boom in japan. The company made almost no attempt to produce bellows camera, except for the ricoh six in 1952.
The company finally took the name of its products, becoming ricoh ( K.K. Rikō, ㈱リコー) in 1963. From 1964, it made a few 35mm SLR with interchangeable 42mm screw histiocytoma dog removal cost lenses, most of which were called singlex. In 1977, it switched to the K mount introduced by pentax, for a series of cameras called XR, made until the 1990s. The only autofocus SLR cameras made by the company were histiocytoma dog removal cost the various mirai, with non-interchangeable zoom lenses.
In 2009, ricoh released the ricoh GXR, an interchangeable lens camera without bayonet. The GXR is an interchangeable unit camera system in which histiocytoma dog removal cost lenses are changed by using a slide-in mount system to attach camera units to the body. The lens, image sensor, and image processing engine are integrated into the lens units histiocytoma dog removal cost so the body itself does not contain an image sensor.
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