U.S. federal trademark · Serial No. 75439311 · Reg. No. 2260695
infrared communication system and its individual components, namely, a miniature FM transmitter, operating in the infrared band, which transmits signals conveying signage information to receivers carried by individuals; a miniature FM receiver which receives the signals from the transmitter; and an electronic recording device which records the signage information for transmission by the transmitter to the receiver
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