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AR245329A1
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Improvements made to differential audio aids, with programmable frequency response.
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GB8509021D0
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Differential hearing aid with programmable frequency response
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Computerized audiometer
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Differential doppler for blood flow measurement
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Improvements made to differential stethoscopes.
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Differential stethoscope distinguishing pulse from body noise
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BR8305652A
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Portable stethoscope to hear internal sounds from a body; process of separating sound from heart beats of a noise-signed sign
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PT77456A
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Differential stethoscope
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AU1970183A
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Differential stethoscope
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DK444083D0
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Stethoscope
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IL69828D0
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Differential stethoscope
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ZA8307159B
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Differential stethoscope
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Electrocardiograph with digitally-printing waveform display
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Differential stethoscope
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