Door viewer

Details Door viewer Door viewer

1988-09-02

1990-09-25

Word, A. Hugo

Photography and optical equipment

Optical article not elsewhere specified

Lens or objective

D16130, D16132

Patent

active

D03108406

REFERENCES:
patent: 3438540 (1969-04-01), Le Roy
patent: 3973835 (1976-08-01), Miyakawa et al.
patent: 4050792 (1977-09-01), Svensson
patent: 4172636 (1979-10-01), Yanagimachi
patent: 4269474 (1981-05-01), Kamimura
patent: 4726670 (1988-02-01), Sherrard et al.
patent: 4730911 (1988-03-01), Wood et al.

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