Title:
Smoke indicating and recording device
United States Patent 1487898
Inventors:
Stolp, Roy C.
Publication Date:
03/25/1924
Export Citation:
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Assignee:
Stolp, Roy C.
Primary Class:
356/438
Other Classes:
250/564, 338/19, 340/578, 340/870.16
International Classes:
G01N21/53; G01N21/47
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