Illumination of pictures
United States Patent 1348957

Inventors:
John, Pope Frederick
Publication Date:
08/10/1920
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Assignee:
William, Thompson B.
Primary Class:
40/444
Other Classes:
315/294, 362/247, 40/716, 362/311, 315/317, 362/253, 340/815.560, 40/463
International Classes:
G09G3/00