21 ELECTRICAL CONTROL DEVICES FOR UTILITY AND INDUSTRIAL USES, SUCH AS ELECTRICALLY OPERATED, CONTROLLED AND SYNCHRONIZED RECORDERS INCLUDING MAGNETIC TAPE RECORDERS; ELECTRICAL COAXIAL POROBES FOR SENSING AND/OR APPLYING ELECTRIC CURRENT SIGNALS AND CONNECTING CABLES AND CABLE ASSEMBLIES FOR UTILITY AND INDUSTRIAL USES; ELECTRONIC WAVE FORM GENERATORS AND ELECTRICAL AMPLIFIERS