Incident light filter for cameras

Details Incident light filter for cameras Incident light filter for cameras

1981-03-16

1983-08-09

Holtje, Nelson C.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

D16137, D1699

Patent

active

D02700697

REFERENCES:
patent: 2503768 (1950-04-01), Riszdorfer
patent: 3747488 (1973-07-01), Bennett
patent: 4352547 (1982-10-01), Sasaya

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