Photography and optical equipment – Optical article not elsewhere specified – Lens or objective
Patent
1991-10-25
1993-07-27
Word, A. Hugo
Photography and optical equipment
Optical article not elsewhere specified
Lens or objective
Patent
active
D03377750
REFERENCES:
patent: D179518 (1957-01-01), Martinez
patent: D203882 (1966-02-01), Hoogesteger
patent: D271698 (1983-12-01), Shishido
Popular Photography, Apr. 1989, p. 42, Sigma APO lens.
Asahi Kogaku Kogyo K.K.
Coles Doris V.
Word A. Hugo
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