Picture viewer

Details Picture viewer Picture viewer

1982-11-29

1985-01-29

Holtje, Nelson C.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

Patent

active

D02773880

REFERENCES:
patent: D138526 (1944-08-01), Spaldo
patent: D173729 (1954-12-01), Helms
patent: D226869 (1973-05-01), Weggeland
patent: D255745 (1980-07-01), Pedersen
patent: D257584 (1980-12-01), Finkel
patent: D270068 (1983-08-01), Ackeret
patent: 2294444 (1942-09-01), Boroughs
patent: 3352043 (1967-11-01), Butts
patent: 3783540 (1974-01-01), Barclay
patent: 4245417 (1981-01-01), Ackeret
patent: 4259802 (1981-04-01), Ackeret

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