Periscopic viewing device

Details Periscopic viewing device Periscopic viewing device

1977-06-20

1979-11-13

Ansher, Bernard

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

D 2234, D16 78, D1606

Patent

active

D02534142

REFERENCES:
patent: D184806 (1959-04-01), Evans
patent: D236284 (1975-08-01), Miller
patent: D245954 (1977-10-01), Tosaw
patent: 2255197 (1941-09-01), Thomas
patent: 2569576 (1951-10-01), Ramme
patent: 3019689 (1962-02-01), Paulsrud
patent: 3410638 (1968-11-01), Langworthy
patent: 3629870 (1971-12-01), Paisley
patent: 4077703 (1978-03-01), Pablo

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