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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:

Showa-Kogaku Gemflex-(I)
Gemflex (I)

Showa-Kogaku Leotax-NR-III
Leotax NR III

Showa-Kogaku Leotax-Special-B
Leotax Special B

Showa-Kogaku Leotax-TV
Leotax TV

Showa-Kogaku Gemflex-(II)
Gemflex (II)

Showa-Kogaku Leotax-FV
Leotax FV

Showa-Kogaku Leotax-S
Leotax S

Showa-Kogaku Leotax-T2
Leotax T2

Showa-Kogaku Gemflex-(II)
Gemflex (II)

Showa-Kogaku Leotax-K
Leotax K

Showa-Kogaku Leotax-Special-(chrome)
Leotax Special (chrome)

Showa-Kogaku Leotax-Special-D-II
Leotax Special D II

Showa-Kogaku Leotax-TV2-(Merit)
Leotax TV2 (Merit)

Showa-Kogaku Leotax-D-IV
Leotax D IV

Showa-Kogaku Leotax-F-(1956:-Leotax-Co.)
Leotax F (1956: Leotax Co.)

Showa-Kogaku Leotax-K3
Leotax K3

Showa-Kogaku Leotax-T
Leotax T

Showa-Kogaku Semi-Leotax-(DL)
Semi Leotax (DL)

Showa-Kogaku Leotax-F-(1954:-Showa-Optical)
Leotax F (1954: Showa Optical)

Showa-Kogaku Leotax-G
Leotax G

Showa-Kogaku Leotax-Special
Leotax Special

Showa-Kogaku Leotax-T2L
Leotax T2L

Showa-Kogaku Leotax-F-(1954:-Showa-Optical)
Leotax F (1954: Showa Optical)

Showa-Kogaku Leotax-F-(1956:-Leotax-Co.)
Leotax F (1956: Leotax Co.)

Showa-Kogaku Leotax-I
Leotax I

Showa-Kogaku Leotax-Special-A
Leotax Special A

Showa-Kogaku Leotax-Special-D-III
Leotax Special D III