Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1975-04-07
1977-03-22
Stearman, Joel
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D163
Patent
active
D02437589
REFERENCES:
patent: D179566 (1957-01-01), Haggar
patent: D217073 (1970-03-01), Portman et al.
patent: D223299 (1972-04-01), Dimitracopoulos
patent: 3413061 (1968-11-01), Simpson et al.
GAF Corporation
Kehm Walter C.
Rademaker C. A.
Stearman Joel
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