Title:
Vacuum mold for molding concrete and the like
Document Type and Number:
United States Patent 2474721

Inventors:
Billner, Karl P.
Publication Date:
06/28/1949
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Assignee:
VACUUM CONCRETE INC
Primary Class:
425/85
International Classes:
B28B7/46; B28B7/40
US Patent References:
2116557Method of and apparatus for the construction of walls and similar forms


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