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Counterbalancing mechanism for articulated overhead doors
US 2,630,597 A
Filed
: 02/18/1950
Issued
: 03/10/1953
Est. Priority Date
: 02/18/1950
Status: Expired due to Term
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Current Assignee
David M Robinson
Original Assignee
David M Robinson
Inventors
Robinson, David M.
Application Number
US03/144,931
Time in Patent Office
1,116 Days
Field of Search
US Class Current
16/198
CPC Class Codes
E05D 13/1261
specially adapted for overh...
E05D 15/248
with lever arms for produci...
E05Y 2201/49
Wrap springs
E05Y 2900/106
for garages
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