FIBER OPTIC CABLE; FIBER OPTIC NODES AND SWITCHES TO TRANSMIT, RECEIVE AND DISTRIBUTE VOICE, DATA, VIDEO AND FACSIMILE COMMUNICATIONS; FIBER OPTIC SIGNAL AMPLIFIERS; FIBER OPTIC SWITCHES WHICH CONVERT ANALOG CO-AXIAL SIGNALS TO DIGITAL FIBER OPTICAL SIGNALS AND WHICH ALSO CONVERT FIBER OPTICAL SIGNALS TO ANALOG CO-AXIAL SIGNALS
Electrical and Scientific Apparatus