Title:
Method of prestressing units with serration
United States Patent 2705360
Inventors:
Fritz, Leonhardt
Publication Date:
04/05/1955
Export Citation:
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Assignee:
Fritz, Leonhardt
Primary Class:
264/275
Other Classes:
52/223.14, 264/314
International Classes:
E04C5/10; E04C5/00
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US Patent References:
2648439Filter bottom
2413990Process of making prestressed reinforced concrete
1949650Method of making concrete conduits
1650307Molded article and method of and apparatus for producing it
Foreign References:
GB239375A