Method of prestressing units with serration
United States Patent 2705360
US Patent References:
Molded article and method of and apparatus for producing it
- - 1650307
Method of making concrete conduits
- - 1949650
Process of making prestressed reinforced concrete
- - 2413990
Filter bottom
- - 2648439
Molded article and method of and apparatus for producing it
- - 1650307
Method of making concrete conduits
- - 1949650
Process of making prestressed reinforced concrete
- - 2413990
Filter bottom
- - 2648439
Inventors:
Fritz, Leonhardt
Publication Date:
04/05/1955
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Assignee:
Fritz, Leonhardt
Primary Class:
Other Classes:
264/314, 52/223.140
International Classes:
E04C5/10; E04C5/00
Foreign References:
| GB239375A |