[ ultrasonic medical diagnostic apparatus;] hearing aids; [ electronystagmographs; electrogustometer; audiometric test booths ]

'aid':6 'apparatus':4 'audiometr':9 'booth':11 'diagnost':3 'electrogustomet':8 'electronystagmograph':7 'hear':5 'medic':2 'test':10 'ultrason':1

viscosimeters, [ seismometers, anemometers, ] noise meters, vibration gauges, audiometers, particle measuring instrument, frequency analyzers, audio level recorders, acoustic calibrator, piston phone

'acoust':17 'analyz':13 'anemomet':3 'audio':14 'audiomet':8 'calibr':18 'frequenc':12 'gaug':7 'instrument':11 'level':15 'measur':10 'meter':5 'nois':4 'particl':9 'phone':20 'piston':19 'record':16 'seismomet':2 'vibrat':6 'viscosimet':1

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