Title:
Visible data system
United States Patent 2226976
Inventors:
Leaming, Silas T.
Publication Date:
12/31/1940
Export Citation:
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Assignee:
Albert, Call E.
Primary Class:
40/405
Other Classes:
40/124, 40/384, 150/147, 206/39, 206/425
International Classes:
B42F17/00; B42F17/08; B42F17/00
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