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GB902501A
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Improvements in miniature inductance devices
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Improvements in and relating to hearing aids
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GB878309A
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Improvements in or relating to hearing-aids
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Improvements in and relating to hearing aids
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Improvements in hearing aids
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GB790318A
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Improvements in and relating to the encasement of electrical devices
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US2916713A
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Miniature transformers and chokes
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Improvements in and relating to oscillation generators employing transistors
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Improvements in or relating to hearing aids
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Improvements in and relating to hearing aids
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GB760421A
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Improvements in and relating to minature electric transformers and chokes
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Improvements in telephone instruments and microphones of the moving coil type
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Improvements in or relating to testing apparatus for short circuited turns
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Improvements in or relating to hearing aids
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Improvements in or relating to telephones
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Improvements in or relating to microphones
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Improvements in or relating to telephone receivers
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GB672988A
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Improvements in or relating to bone conduction hearing aids
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GB671957A
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Improvements in or relating to bone conduction telephone receivers
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GB654538A
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Improvements in or relating to telephone receivers
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