Collapsible viewer

Details Collapsible viewer Collapsible viewer

1985-09-24

1989-03-07

Holtje, Nelson C.

Photography and optical equipment

Projector or viewer

Integrated unit

Patent

active

D03001458

REFERENCES:
patent: D250266 (1978-11-01), Overman
patent: D266094 (1982-09-01), Gher
patent: D268592 (1983-04-01), Miller
patent: D268680 (1983-04-01), Smargiassi
patent: D270066 (1983-08-01), Ackeret
patent: 3532419 (1970-10-01), Tanaka

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