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ELECTROMECHANICAL RELAYS, [ REED RELAYS, ] ELECTROMECHANICAL MAGNETICALLY LATCHING RELAYS, [ ACOUSTICAL SWITCHES, STEPPING MOTORS, STEPPING MOTOR DRIVES, STEPPING MOTOR SWITCH COMBINATIONS, ] MAGNETIC AMPLIFIERS, PHOTO RELAYS, LIGHT SOURCES FOR PHOTO RELAYS, TRANSISTOR AMPLIFIERS, [ SERVO-MECHANISMS, ] TRANSFORMERS AND RECTIFIER ASSEMBLIES