Door viewer

Details Door viewer Door viewer

1991-11-07

1992-10-13

Word, A. Hugo

Photography and optical equipment

Optical article not elsewhere specified

D16132, D16135

Patent

active

D03302113

REFERENCES:
patent: D310940 (1990-09-01), Degnan
patent: 3973835 (1976-08-01), Miyakawa et al.
patent: 4050792 (1977-09-01), Svensson
patent: 4251127 (1981-02-01), Yamaguchi
patent: 4269474 (1981-05-01), Kamamura
patent: 4964711 (1990-10-01), Degnan

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