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Diagnosticum
United States Patent 1988634
Inventors:
Stonecypher, David D.
Publication Date:
01/22/1935
View Patent Images:
Download PDF 1988634
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Assignee:
Stonecypher, David D.
Primary Class:
434/262
Other Classes:
600/301
International Classes:
G06K21/04
;
G06K21/00