ELECTROTECHNICAL, ELECTRONIC, OPTIC, ACOUSTIC, PHYSICAL DEVICES AND THEIR COMPONENTS, namely, GYROSTABILIZERS, [ THRUST RECORDERS, PRESSURE METERS, ] DIAL GAUGES, [ PRESSURE SWITCHES, ] ELECTROMECHANICAL PRECISION RHEOSTATS, INDUCTIVE MEASURING INSTRUMENTS, IN PARTICULAR INDUCTIVE MOTION PICKUPS; ELECTRICAL AMPLIFIERS, [ DECADE SWITCHES, ] IMPEDANCE TRANSFORMERS; MECHANICAL AND ELECTRICAL DIGITAL DISPLAYS [, ELECTROMOTORS, IN PARTICULAR MEASURING MOTORS ] ; [ DIGITAL POTENTIOMETERS, DIGITAL C...