4. Telephonic communications
  5. Substation or terminal circuitry
  6. Conversion of signal form
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Noise cancellation apparatus

Telephonic communications – Substation or terminal circuitry – Conversion of signal form
Patent

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Noise cancelling apparatus for a telephone handset

Telephonic communications – Substation or terminal circuitry – Conversion of signal form
Patent

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Noise-canceling differential microphone assembly

Telephonic communications – Substation or terminal circuitry – Conversion of signal form
Patent

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Nonsaturating interface supply

Telephonic communications – Substation or terminal circuitry – Conversion of signal form
Patent

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