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Automatic door opener
US 2,553,023 A
Filed
: 02/25/1947
Issued
: 05/15/1951
Est. Priority Date
: 02/25/1947
Status: Expired due to Term
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28
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28 Citations
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Current Assignee
John Walters
Original Assignee
John Walters
Inventors
Walters, John
Application Number
US02/730,785
Time in Patent Office
1,540 Days
Field of Search
US Class Current
49/276
CPC Class Codes
E05B 17/0033
for opening only E05B17/002...
E05B 47/0047
Striker rotating about an a...
Y10T 292/699
Motor controlled
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