Title:
Picture-projector
United States Patent 1373491

Inventors:
Detwiler, Frank J.
Burkholder, Melvin H.
Publication Date:
04/05/1921
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Assignee:
Detwiler, Frank J.
Burkholder, Melvin H.
Primary Class:
353/63
Other Classes:
353/119
International Classes:
G03B21/06