Building block
United States Patent 2194047

Inventors:
Markle, Sidney H.
Publication Date:
03/19/1940
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Assignee:
Markle, Sidney H.
Primary Class:
52/410
Other Classes:
52/563, 52/405.300
International Classes:
E04B2/30; E04C1/41; E04B2/28; E04C1/00