Method and means for constructing hollow-concrete walls
United States Patent 1712678

Inventors:
Thomas, Redman William
Publication Date:
05/14/1929
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Assignee:
Thomas, Redman William
Primary Class:
249/16
Other Classes:
249/140, 249/20, 249/15, 249/35
International Classes:
B28B7/18; B28B7/16