ESSENTIAL SWITCH SYSTEMS

OPTICAL FIBER SIGNAL TRANSMISSION MACHINE; OPTICAL FIBER SIGNAL REGENERATOR; OPTICAL FIBER SIGNAL RECEIVER; OPTICAL FIBER COMMUNICATION MACHINE, NAMELY, SYNCHRONOUS DIGITAL HIERARCHY ADD/DROP MULTIPLEXER; OPTICAL MODEM FOR USE WITH OPTICAL FIBER; OPTICAL SIGNAL REPEATER; COAXIAL CABLE SIGNAL CARRIER; SIGNAL RECEIVER; PULSE CODE MODULATION SIGNAL CARRIER, NAMELY, TL/EL LEASE LINE EQUIPMENT, NAMELY, MULTIPLEXERS AND MODEMS; SIGNAL INTENSIFIER; SOUND AMPLIFIER; RADIO TRANSMITTER; ELECTRONIC SWITCH; TELECOMMUNICATION MACHINE, NAMELY, FACSIMILE MACHINE; COMPUTER PROGRAMS FOR USE IN DATABASE MANAGEMENT AND AS A SPREADSHEET; COMPUTER FIRMWARE FOR USE IN DATABASE MANAGEMENT AND FOR USE AS A SPREADSHEET; COMPUTER NETWORK CONTROLLER, NAMELY, INTEGRATED CIRCUITS; TELEPHONE SWITCH; AUTOMATIC CIRCUIT SENSOR; NETWORK INTERFACE CARDS FOR INTERFACING A COMPUTER TO A LOCAL OR GLOBAL COMPUTER NETWORK; HUB FOR NETWORKING COMPUTERS; ROUTER FOR INTERFACING A COMPUTER OR A LOCAL AREA COMPUTER NETWORK TO A GLOBAL COMPUTER NETWORK; NETWORK GATEWAY; NETWORK BRIDGE; INTERNET PHONE; MODULATOR AND DEMODULATOR MODEM; TELECOM TRANSMISSION MULTIPLEXER; TELECOM TRANSMISSION CONCENTRATOR; NETWORK TRANSMISSION MULTIPLEXER; NETWORK TRANSMISSION CONCENTRATOR