Title:
Manhole and cistern construction
United States Patent 2002127

Inventors:
Paul, O'neal Nathaniel
Publication Date:
05/21/1935
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Assignee:
Paul, O'neal Nathaniel
Primary Class:
52/20
Other Classes:
52/575, 52/184, 52/606
International Classes:
E04H7/18; E04H7/00