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Title:
Multiple torsion spring
Document Type and Number:
United States Patent 2481037
Inventors:
Pringle, Edward S.
Publication Date:
09/06/1949
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Referenced by:
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Assignee:
J G WILSON CORP
Primary Class:
254/340
Other Classes:
160/189, 414/913, 254/362, 267/155, 254/364
International Classes:
F16F3/04
;
F16F3/00
US Patent References:
0633328
0740114
1464294
Counterbalanced hoisting mechanism
1723484
Spring
2226017
Closure
Foreign References:
AT85808B
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