Device for exhibiting transparencies
United States Patent 2322023

Inventors:
Hopkins, Roy S.
Publication Date:
06/15/1943
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Assignee:
EASTMAN KODAK CO
Primary Class:
352/104
Other Classes:
353/72, 353/81, 352/113
International Classes:
G02B17/02; G03B21/10; G03B29/00; G02B17/00