Title:
Activated changeable advertising sign
Document Type and Number:
United States Patent 3304638


Inventors:
Grandell, William A.
Wasson, James M.
Wasson, Richard Z.
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Publication Date:
02/21/1967
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Assignee:
James, Wasson M.
Primary Class:
40/505
Other Classes:
D20/21, 40/473
International Classes:
G09F11/02; G09F11/00
US Patent References:
1256645
2149551Apparatus for publicity
2209858Intermittent movement for display devices


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