Girder made up of structural members
United States Patent 2975874
US Patent References:
/0686817.html
- - 0686817

Metal lumber
- - 1997876


Inventors:
Alberto, Pagan
Publication Date:
03/21/1961
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Assignee:
Alberto, Pagan
Primary Class:
138/163
Other Classes:
138/157, 52/844
International Classes:
E04C3/07; E04C3/04