Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1982-07-12
1984-08-28
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
Patent
active
D02752948
REFERENCES:
patent: D203678 (1966-02-01), Newton
patent: D226032 (1973-01-01), Siesholtz
patent: D233170 (1974-10-01), Gideon
patent: D248305 (1978-06-01), Scott
patent: 3732368 (1973-05-01), Mahlab
patent: 3739703 (1973-06-01), Behles
patent: 4320949 (1982-03-01), Pagano
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