Title:
Scaffold-supporting machine
Document Type and Number:
United States Patent 1352455

Inventors:
Johnston, Frank B.
Publication Date:
09/14/1920
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Referenced by:
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Assignee:
AMERICAN SAFETY DEVICE COMPANY
Primary Class:
254/296
Other Classes:
254/299, 254/310, 254/312, 182/144
International Classes:
E04G1/18




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