Portable hand-held viewing apparatus

Details Portable hand-held viewing apparatus Portable hand-held viewing apparatus

1983-01-28

1985-09-03

Holtje, Nelson C.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

D16 15

Patent

active

D02804158

REFERENCES:
patent: D112013 (1938-11-01), Whitman
patent: D120973 (1940-06-01), Freeman
patent: D162148 (1951-02-01), Fuller
patent: D174119 (1955-03-01), Fuller
patent: D254010 (1980-01-01), Elsner
patent: 1516496 (1924-11-01), Owens
patent: 1553906 (1925-09-01), Marette
patent: 1957378 (1934-05-01), Zimmerman
patent: 1997642 (1935-04-01), Klein
patent: 2394711 (1946-02-01), Miesegaes
patent: 2449483 (1948-09-01), Iwick

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