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US Patent 7493991 Electromagnetic/ultrasonic roll-calling/answering (EURA) system for elevator positioning

Patent 7493991 was granted and assigned to Otis Elevator Company on February, 2009 by the United States Patent and Trademark Office.

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Patent abstract

A positioning system for an elevator cab (37) includes transponder modules (10) having a unique ID for receiving a signal (39) and emitting an ultrasonic signal when the signal is equivalent to the unique ID with a determination of position based on the time duration of the signals.

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