Rudolf Ruehl

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E. Leitz Photographic Patents by Rudolf Ruehl

1966 MAR 28 - PHOTO LENS WITH A SHORT FOCAL LENGTH AND LARGER BACK INTERCEPTOR FOCAL LENGTH (7 / 5)
1972 MAR 22 - WIDE ANGLE LENS (8 / 8 - see above and 28mm f/2.8 Elmarit-R I)

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