Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1980-02-28
1982-04-06
Sebastian, Leland A.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D16 11, D16 14, D1603
Patent
active
D02637197
REFERENCES:
patent: D182709 (1958-05-01), Bravo
patent: D222509 (1971-10-01), Andres et al.
patent: D252932 (1979-09-01), Felder
patent: D257535 (1980-11-01), Zellner
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