Title:
Collapsible girder
United States Patent 3152347
US Patent References:
/0294275.html
- - 0294275

/0430935.html
- - 0430935

/0530120.html
- - 0530120

Extension tower
- - 1511679

Collapsible tower
- - 1708113


Inventors:
Williams, Dale R.
Publication Date:
10/13/1964
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Assignee:
Williams, Dale R.
Primary Class:
52/109
Other Classes:
254/122, 52/644, 14/45
International Classes:
E04C3/00; E04G11/54; E04G11/00
US Patent References:
2344772Narrow foldable bridge
2543296Tire and wheel dolly and lift
2767812Extensible structure
3034765Lifting devices
Foreign References:
IT447143B
GB726658A