Photography
United States Patent 1812448

Inventors:
Reilly, John J.
Gilmartin, William A.
Publication Date:
06/30/1931
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Assignee:
Reilly, John J.
Gilmartin, William A.
Primary Class:
355/80
Other Classes:
355/132, 355/101
International Classes:
G03B27/08; G03B27/02