Title:
Testing and display device
Document Type and Number:
United States Patent 1483662
Inventors:
Jamar, Mitchell F.
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Publication Date:
02/12/1924
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Referenced by:
Export Citation:
Assignee:
Jamar, Mitchell F.
Primary Class:
International Classes:
G01N3/56; G01N3/02; G01N33/36; G01N3/00