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DE2529454A1
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Defective hearing simulator with audiogram representation - having bank of RC filters with independent damping and outputs connected to amplifier
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DE2512343A1
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Hearing aid with closed sleeve connected to earphone channel - gives bass tones using only treble earphone
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DE2406219A1
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Hearing aid with flat transducers - electro-acoustical transducers mounted next to each other in upper part of case
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DE2406218A1
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Hearing aid with battery case and controls in pocket - has reception and reproduction transducers in part worn directly behind ear
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DE2346531A1
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Hearing aid with directional microphone - has device converting microphone lobe characteristic into spherical characteristic
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DE2303194A1
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Hearing aid for the severely handicapped or severely handicapped
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DE2249303A1
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Hearing aid for the severely handicapped or severely handicapped
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DE1119338B
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Hearing aid for the hard of hearing to be worn behind the auricle
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DE1132973B
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Hearing aid for the hard of hearing to be worn behind the auricle
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DE1114848B
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Housing for hearing aids for hearing impaired people to be worn behind the ear
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DE1078175B
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Hearing aid for the hard of hearing to be worn behind the auricle
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DE1096960B
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Housing for electrical hearing aids
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DE1088100B
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Hearing aid for the hearing impaired
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DE1031835B
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Device for the selection and adjustment of hearing aids for the hard of hearing
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