APPARATUS FOR EDUCATING DEAF PERSONS, DEAF MUTES AND THE SUBNORMAL IN SCHOOL IN HEARING AND SPEAKING, COMPRISING COMBINATIONS OF PHONOGRAPHS AND HEADSET; [ PHONOGRAPHS; PHONOGRAPHS WITH COORDINATED VISUAL DISPLAYS; ] SOUND AMPLIFIERS AND SOUND AMPLIFYING INSTALLATIONS; PARTS THEREFOR; AND ACCESSORIES THEREFOR-NAMELY, ELECTRIC CURRENT SUPPLY MEANS, EARPLUGS, EARPADS; SOUND AMPLIFYING INDUCTIVE DEVICES FOR APPLICATION TO TELEPHONES; AUDIOMETERS; SILENT CABINS; TEST INSTALLATIONS FOR DETERMINING THE RESPONSE LEVEL AND/OR RESPONSE TIME OF HUMAN SUBJECTS; SOLD AS A UNIT AND PARTS THEREFOR

'accessori':38 'amplifi':30,33,49 'and/or':66 'apparatus':1 'applic':53 'audiomet':56 'cabin':58 'combin':18 'compris':17 'coordin':26 'current':43 'deaf':4,6 'determin':62 'devic':51 'display':28 'earpad':47 'earplug':46 'educ':3 'electr':42 'headset':22 'hear':14 'human':70 'induct':50 'instal':34,60 'level':65 'mean':45 'mute':7 'name':41 'part':35,77 'person':5 'phonograph':20,23,24 'respons':64,67 'school':12 'silent':57 'sold':72 'sound':29,32,48 'speak':16 'subject':71 'subnorm':10 'suppli':44 'telephon':55 'test':59 'therefor':36,40,78 'therefor-nam':39 'time':68 'unit':75 'visual':27

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