COILED SPRING ASSEMBLIES
United States Patent 3429072

Inventors:
Sammons, Douglas Charles
Publication Date:
02/25/1969
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Assignee:
Douglas, Charles Sammons
Primary Class:
49/203
Other Classes:
160/191, 267/74
International Classes:
E05F1/10; E05F1/00; E05D15/40; E05F11/04; E05F11/08
US Patent References:
2926727Doors
2953928Reciprocal movement control mechanism
2985446Garage door operating mechanism




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