Photography and optical equipment – Optical article not elsewhere specified – Lens or objective
Patent
1991-10-18
1993-08-10
Word, A. Hugo
Photography and optical equipment
Optical article not elsewhere specified
Lens or objective
Patent
active
D03382192
REFERENCES:
patent: D179518 (1957-01-01), Martinez
patent: D203882 (1966-02-01), Hoogesteger
patent: D271698 (1983-12-01), Shishido
patent: 3138060 (1964-06-01), Egeert et al.
patent: 4005263 (1977-01-01), Collet
Popular Photography, Apr. 1989, p. 42, Sigma APO Lens.
Asahi Kogaku Kogyo K.K.
Coles Doris V.
Word A. Hugo
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