DATA ACQUISITION SYSTEMS; DIGITAL TO ANALOG CONVERTERS; ANALOG TO DIGITAL CONVERTERS; PRECISION VOLTAGE SOURCES; DIFFERENTIAL VOLTMENTERS; ANALOG TO DIGITAL MULTIPLEXERS; DATA DISTRIBUTORS; SEISMIC RECORDING SYSTEMS; LOGGING SYSTEMS; SAMPLE AND HOLD SYSTEMS; DIGITAL COMPUTER CIRCUITS; ANALOG COMPUTER CIRCUITS; AND COUNTERS

'acquisit':2 'analog':6,8,17,35 'circuit':34,37 'comput':33,36 'convert':7,11 'counter':39 'data':1,21 'differenti':15 'digit':4,10,19,32 'distributor':22 'hold':30 'log':26 'multiplex':20 'precis':12 'record':24 'sampl':28 'seismic':23 'sourc':14 'system':3,25,27,31 'voltag':13 'voltment':16

BUFFER AMPLIFIER ASSEMBLIES; TAPE FORMAT SEQUENCERS; AMPLIFIERS; DIFFERENTIAL AMPLIFIERS; CIRCUIT BOARDS CONTAINING ELECTRONIC AND ELECTRICAL COMPONENTS; POWER SUPPLIES; TRANSFORMERS; AND FILTERS

'amplifi':2,7,9 'assembl':3 'board':11 'buffer':1 'circuit':10 'compon':16 'contain':12 'differenti':8 'electr':15 'electron':13 'filter':21 'format':5 'power':17 'sequenc':6 'suppli':18 'tape':4 'transform':19

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