Pre-stressed truss
United States Patent 3377637
US Patent References:
/1163641.html
- - 1163641

Portable shelter
- - 2693195

Mold for constructing trusses
- - 1761306

Method of erecting bridge structures
- - 2854742


Inventors:
Ramirez, Zamorano Luis
Publication Date:
04/16/1968
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Primary Class:
14/24
Other Classes:
52/639, 52/644, 14/9
International Classes:
E04C3/10; E04C3/40; E04C3/04; E04C3/38
Foreign References:
AT65502B
GB759703A