Lens mask

Details Lens mask Lens mask

1980-06-13

1982-10-05

Holtje, Nelson C.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

D1605

Patent

active

D02664321

REFERENCES:
patent: 1062247 (1913-05-01), Moine
patent: 1572315 (1926-02-01), Scholl
patent: 2866397 (1958-12-01), Gillette
patent: 3682075 (1972-08-01), Profitt
patent: 4079394 (1978-03-01), Roncone
patent: 4107716 (1978-08-01), Pfefer

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