Dental appliance
United States Patent 2257709

Inventors:
Anderson, Louis P.
Publication Date:
09/30/1941
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Assignee:
Anderson, Louis P.
Primary Class:
433/25
Other Classes:
128/861, 433/215, 601/139, 15/167.200
International Classes:
A61C17/00; A61C19/06; A61C19/00