ELECTRICAL MEASURING AND INDICATING INSTRUMENTS [ ELECTRONIC COUNTER AND TIMER INSTRUMENTS, INSTRUMENTS AND APPARATUS FOR DETERMINING HUMIDITY AND THE MOISTURE CONTENT OF MATERIALS; THERMOMETERS; LIGHT-MEASURING INSTRUMENTS; STANDARD CELLS; ELECTRICAL CIRCUIT ANALYSERS; TACHOMETERS, TACHOMETER GENERATORS, A.C., D.C. ] AND [ FREQUENCY GENERATORS, ] ELECTRICAL RESISTORS AND POTENTIOMETERS [ ; ELECTRICAL APPARATUS FOR TESTING RADIO AND TELEVISION EQUIPMENT; AND INSTRUMENT CALIBRATORS, ]

'a.c':36 'analys':32 'apparatus':13,46 'calibr':55 'cell':29 'circuit':31 'content':20 'counter':7 'd.c':37 'determin':15 'electr':1,30,41,45 'electron':6 'equip':52 'frequenc':39 'generat':35,40 'humid':16 'indic':4 'instrument':5,10,11,27,54 'light':25 'light-measur':24 'materi':22 'measur':2,26 'moistur':19 'potentiomet':44 'radio':49 'resistor':42 'standard':28 'tachomet':33,34 'televis':51 'test':48 'thermomet':23 'timer':9

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