Title:
Counterbalance and stop means for upwardly acting closures
Document Type and Number:
United States Patent 3095922

Inventors:
Frazier, Russel B.
Publication Date:
07/02/1963
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Assignee:
OVERHEAD DOOR CORP
Primary Class:
160/191
US Patent References:
2314015Counterbalance for overhead doors
2480865Leverage pulley


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