Magnifier for calculator read out

Details Magnifier for calculator read out Magnifier for calculator read out

1975-06-04

1977-02-08

Ansher, Bernard

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

D1606

Patent

active

D02433290

REFERENCES:
patent: 2586581 (1952-02-01), Tschischeck
patent: 2736097 (1956-02-01), Coleman, Jr.
patent: 2746346 (1956-05-01), Gaire
patent: 2957390 (1960-10-01), Baukus
patent: D211369 (1968-06-01), Hitchcock

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