Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1980-10-03
1983-12-20
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D14110, D1603
Patent
active
D02718820
REFERENCES:
patent: D238004 (1975-12-01), Hamquist
patent: D260258 (1981-08-01), Loos
patent: 4328963 (1982-05-01), DuBois et al.
patent: 4332377 (1982-06-01), DuBois et al.
DuBois R. Clark
Hamma John C.
Gradco Dendoki, Inc.
Holtje Nelson C.
Lee, Jr. Newton H.
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