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Riken prewar timeline (edit) later->
Type 1930s 1940s
4 5 6 7 8 9 0 1 2 3
                                                                                                   
telescopic 24×36 Super Olympic D Super Olympic DIII
3×4 Olympic A (dates?) Olympic B
Olympic Junior
Olympic C
4×4 Olympic Four I Olympic Four II
? ... Seica
Letix
Roico ... Roico II
4×6.5 Vest Olympic
4.5×6 Semi Olympic I ... Semi Olympic II
focal plane 3×4 Riken No.1 ... Gokoku Ricohl I Ricohl IIB
folding 3×4 ... Kinsi I
4×4 Adler IV (dates?)
4.5×6 Adler A & B ...
Adler III ... Adler CII
Gaica Gaica II
Semi Heil Heil C
6×6 Adler Six
pseudo TLR 3×4 Chukon Ref
TLR 6×6 Ricohflex ... Ricohflex B
Company: Olympic Camera Works Asahi Kōgaku Kōgyō ...
Riken Kōgaku Kōgyō
Cameras whose actual existence is dubious are in a lighter shade.
Cameras in yellow are variants sold and maybe assembled by other companies.
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