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United States Patent 2348250

Inventors:
Gardner, William M.
Gardner, Mary C.
Publication Date:
05/09/1944
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Assignee:
GARDNER DISPLAYS COMPANY
Primary Class:
40/411
Other Classes:
446/178, 40/412, 446/199, 472/84, 446/186, 40/419
International Classes:
G09F19/08; G09F19/02; G09F19/00