Collapsible periscope

Details Collapsible periscope Collapsible periscope

1978-03-13

1980-08-05

Ansher, Bernard

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

D1606

Patent

active

D02562502

REFERENCES:
patent: D236284 (1975-08-01), Miller
patent: 3357777 (1967-12-01), Kallio
patent: 3551032 (1970-12-01), Dunn, Jr.
patent: 3619040 (1971-11-01), Rickets

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