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US Patent 7731000 Roll-calling mechanism based vision system for elevator positioning

Patent 7731000 was granted and assigned to Otis Elevator Company on June, 2010 by the United States Patent and Trademark Office.

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Patent abstract

A positioning system having a plurality of transponder modules each located at a known location for receiving an electromagnetic signal and emitting a light signal, at least one transceiver module for emitting an electromagnetic signal and receiving the light signal, and apparatus processing the received light signal to determine a position of the at least one transceiver module.

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