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1-piece acoustic advertising alternating current amplifier At-ear audiologist Barrette battery Behind-ear bone conduction carbon aids carbon microphone Corp Crystal mic Custom In-ear deaf Deluxe device diaphragm dot Gain Double mic ear canal ear trumpets ear-level earmold earphone eartip electric electrons Established ext rec eyeglass fitting frequency response Front mic Gain 38 Gain 40 Glasses Green dot grid headband hearing aid dealers hearing aid industry hearing aid manufacturers hearing loss input instrument int rec integrated circuit license Maico mercury cell metal microphone Modified mold NHAJ non-electric Opt AVC Oticon Output patent plastic plate president Printed circuit purchased Radioear receiver Red dot resistor shown in Figure silicon silver oxide Sonotone sound Sub-models Super table model thick tion tone control Top mic Tradename transistor triode tube hearing aid vacuum tube vacuum tube hearing voltage volts volume control wearable