Camera diaphragm unit

Photography and optical equipment – Camera or body therefor – Element

Patent

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Patent

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D03157431

REFERENCES:
patent: D106062 (1937-09-01), Riddell
patent: D119256 (1940-03-01), Darling
patent: 1503800 (1924-08-01), Ott
patent: 1547658 (1925-07-01), Kunze
patent: 3232200 (1966-02-01), Baab et al.

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