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Educational device
United States Patent 1837194
Inventors:
Baumgarten, Samuel L.
Publication Date:
12/22/1931
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Download PDF 1837194
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Assignee:
Baumgarten, Samuel L.
Primary Class:
273/142JA
Other Classes:
D21/374, 273/272, 434/167
International Classes:
A63F5/04