Bubble producing and display means
United States Patent 2133499

Inventors:
Dolan, David J.
Publication Date:
10/18/1938
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Assignee:
Dolan, David J.
Primary Class:
40/408
Other Classes:
40/477, 239/19, 446/15, 261/DIG.026
International Classes:
G09F13/24; G09F13/00