ELECTRICAL APPARATUS AND INSTRUMENTS FOR USE IN THE ELECTRICAL AND ELECTRONIC INDUSTRY, NAMELY, SATURABLE NOISE SUPPRESSION CHOKES, POWER INDUCTORS, EARTH LINE CHOKES, STORAGE CHOKES, DRIVER TRANSFORMERS, PULSE TRANSFORMERS, POWER LINE MODEM TRANSFORMERS, CURRENT SENSE TRANSFORMERS, INTERFACE TRANSFORMERS, KEYBOARD SWITCHES AND PARTS THEREOF; MEASURING, SIGNALING, CHECKING AND TEACHING APPARATUS AND INSTRUMENTS, NAMELY, SATURABLE NOISE SUPPRESSION CHOKES, POWER INDUCTORS, EARTH LINE CHOKES,ST...

RHEOSTATS, VARIABLE RESISTORS, AND RESISTANCE-TYPE POTENTIOMETAERS