Viewer for a door

Details Viewer for a door Viewer for a door

1987-04-20

1990-04-10

Burke, Wallace R.

Photography and optical equipment

Optical article not elsewhere specified

Patent

active

D03071537

REFERENCES:
patent: 2064963 (1936-12-01), Wheeler
patent: 2169874 (1939-08-01), Hardt
patent: 3973835 (1976-08-01), Miyakawa et al.
patent: 4726670 (1988-02-01), Sherrard

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