9 Radio transmitters and receivers for underground use and shielded spaces; wireless extension systems for tunnels, namely, distributed antenna systems comprising base interface units to connect to base radios, in-tunnel network signal boosters, in-tunnel cabling and tunnel network antenna; communication data and wireless systems for confined and shielded spaces, namely, mines, railroads, mass transit, and other infrastructure tunnels, as well as commercial and industrial applications, comprised of base interface units to connect to base radios, network amplifiers, in-tunnel cabling and antennas; wireless radio frequency identification (RFID) systems for tracking personnel and assets, comprised of RFID beacon devices and readers to receive, store and re-transmit data via wireless connection; distributed antenna systems designed to extend two-way wireless data and voice signals in zones normally shielded from coverage by conventional wireless systems, comprised of interface units to connect to base radios, network amplifiers, repeaters, and signal antennas; devices for radio communication and tracking systems, namely, RFID readers and wireless readers; radio communication and signal booster for use in tunnel site communication networks, namely, signal booster for use with a radio signal transmitter, repeaters, exciters, antennas, and fiber optic cabling, in order to extend radio coverage in and beyond tunnel site communication networks; distributed antenna system for use in underground mines and other confined and shielded spaces, namely, railroad, mass transit, and infrastructure and industrial tunnels, namely, temporarily occupied spaces, namely, water tunnels, steam tunnels, and other maintenance tunnels, comprised of coaxial radiating cable, fiber optic cable, amplifiers, cable splitters, antennas, and an interface to connect to a repeater radio operating in the VHF, UHF, and LTE radio bands
Trademark: 90750726
