Picture viewer

Details Picture viewer Picture viewer

1981-05-06

1983-08-09

Holtje, Nelson C.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

D16 14, 40513, D1699

Patent

active

D02700670

REFERENCES:
patent: D112415 (1938-11-01), Zumft
patent: D230773 (1974-03-01), Arnold
patent: D240492 (1976-07-01), Burin
patent: D255745 (1980-07-01), Pedersen
patent: D261479 (1981-10-01), Marks
patent: D265485 (1982-07-01), Liptak
patent: 1940328 (1933-12-01), Schrotenboer
patent: 2294444 (1947-09-01), Boroughs
patent: 2895247 (1959-07-01), Beck
patent: 3695537 (1972-10-01), Alleman
patent: 3783540 (1974-01-01), Barclay
patent: 4057920 (1977-11-01), Weggeland
patent: 4192905 (1980-03-01), Scheibal
patent: 4242820 (1981-01-01), Ackeret
patent: 4259802 (1981-04-01), Ackeret

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