Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1982-06-03
1984-09-18
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D16 27, D16 29, D16 34
Patent
active
D02755734
REFERENCES:
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patent: D236381 (1975-08-01), Evenson
patent: D240080 (1976-05-01), Brown
patent: D247295 (1978-02-01), Cherian
patent: D263963 (1982-04-01), Schlagheck
patent: 3522991 (1970-08-01), Bowen
Holtje Nelson C.
Vivitar Corporation
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