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Revolving Door Control, Inc. Patents
Assignee:
Revolving Door Control, Inc.
Address:
Claremont, CA
No. of patents:
1
Patents:












Patent Number Title Of Patent Date Issued
5012455 Security door with improved sensor for detecting unauthorized passage April 30, 1991
A control system for a revolving door includes an ultrasonic sensor having multiple sensor heads. The door has a housing, and multiple moveable compartments formed by door wings attached to and radially extending from a rotatable axis. The sensors emit energy waves into the housing in

 
 
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