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Automatic door operator
US 2,758,835 A
Filed
: 07/31/1952
Issued
: 08/14/1956
Est. Priority Date
: 07/31/1952
Status: Expired due to Term
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30
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Current Assignee
Lance A. Wikkerink
Original Assignee
Lance A. Wikkerink
Inventors
Wikkerink, Lance A.
Application Number
US03/301,871
Time in Patent Office
1,475 Days
Field of Search
US Class Current
49/30
CPC Class Codes
E05F 15/53
for swinging wings
Y10T 74/20558
Variable output force
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