AMPLAID

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