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GB9926034D0
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An improved hearing aid
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GB9918241D0
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An improved means of retrieving remote objects
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GB9808556D0
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An improved gradual-transition vibrational absorber
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GB9800535D0
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An improved design of radiant energy collector
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GB9726370D0
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A means of improving the performance of multifocal lens specacles
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GB9721923D0
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Improved telephone earpiece coupler
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GB9714667D0
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An improved stereophonic sound system
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GB9714668D0
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Improved designs of heating from natural sources
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GB9711651D0
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An improved voice-coil assembly
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GB9702208D0
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A device for significantly increasing the permissible input energy to a transducer
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GB9613252D0
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A device for increasing the intelligibility of a speech signal
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GB9605018D0
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An improved commentators noise cancelling microphone
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GB9602915D0
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An improved microphone having a directivity which can be varied
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GB9520789D0
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An improved loudspeaker system
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GB9516331D0
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An improved header-type combine harvester
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GB9425755D0
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A communication system suitable for persons having seriously impaired hearing or sight
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GB9411171D0
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A system for reducing the heat generated in transducers in amplifiers
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GB9325257D0
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Improved low frequency sound quality from electrodynamic loudspeakers
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GB9318173D0
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A means of reducing the non-linearity of the input/output transfer characteristic of loudspeakers in the bass region
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GB9316096D0
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A device for reducing the engine thrust required for flying-boat types of craft to become airborne
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