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 Shōwa Kōgaku was founded in 1938 in Tokyo by Nakagawa Kenzō. For the first year it was in business, it was known as Kyōei-sha; it was then renamed to Shōwa Kōgaku. Later, it was renamed several additional times, and was known first as Shōwa Kōgaku Seiki K.K. and then as Leotax Camera K.K. This company ceased camera production in 1961. |
| Showa Kogaku cameras: | Years of manufacture: | |
| Gemflex (I) | c1949 |       |
| Gemflex (II) | c1949 |  |
| Leotax Baby | 1941 |  |
| Leotax D IV | 1950 | |
| Leotax Elite | 1959 | |
| Leotax F (1954: Showa Optical) | 1954 | |
| Leotax F (1956: Leotax Co.) | 1956 | |
| Leotax FV | 1958 | |
| Leotax G | 1961 | |
| Leotax I | 1940 |  |
| Leotax K | 1955 | |
| Leotax K3 | 1958 |  |
| Leotax NR III | 1949 | |
| Leotax S | 1952 | |
| Leotax Special | c1940s | |
| Leotax Special (chrome) | c1940s | |
| Leotax Special A | c1940s | |
| Leotax Special B | c1940s | |
| Leotax Special D II | 1947 | |
| Leotax Special D III | 1947 | |
| Leotax T | 1955 | |
| Leotax T2 | 1958 | |
| Leotax T2L | 1959 | |
| Leotax TV | 1957 | |
| Leotax TV2 (Merit) | 1958 | |
| Semi Leotax (1941) | 1941 | |
| Semi Leotax (1949) | 1949-1951 | |
| Semi Leotax (DL) | 1951 | |
| Semi Leotax R | 1952 | |
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