Title:
Collapsible girder
United States Patent 3152347
Inventors:
Williams, Dale R.
Publication Date:
10/13/1964
Export Citation:
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Assignee:
Williams, Dale R.
Primary Class:
52/109
Other Classes:
14/45, 52/644, 254/122
International Classes:
E04C3/00; E04G11/54; E04C3/00; E04G11/00
View Patent Images:
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US Patent References:
3034765Lifting devices
2767812Extensible structure
2543296Tire and wheel dolly and lift
2344772Narrow foldable bridge
1708113Collapsible tower
1511679Extension tower
0530120N/A
0430935N/A
0294275N/A
Foreign References:
IT447143B
GB726658A