Title:
Dental rack and timer
Document Type and Number:
United States Patent 1923978
Inventors:
Hill, David B.
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Publication Date:
08/22/1933
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Referenced by:
Export Citation:
Assignee:
Hill, David B.
Primary Class:
Other Classes:
434/263, 368/93, 248/111, 211/87.010, 211/65
International Classes:
A47K1/09; G09B19/00; A47K1/08