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Cover for manholes and analogous devices
United States Patent 1458391
Inventors:
James, Burton Thomas
Publication Date:
06/12/1923
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Download PDF 1458391
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Assignee:
James, Burton Thomas
Primary Class:
137/371
Other Classes:
404/25, 292/6, 137/383
International Classes:
F16J13/08
;
F16J13/00