Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1982-04-28
1985-02-05
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
Patent
active
D02774887
REFERENCES:
patent: D239206 (1976-03-01), Valle
patent: D260653 (1981-09-01), Harrigan
Holtje Nelson C.
Kolorkraft Photography Pty. Ltd.
Rosenberg Morton J.
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