4. Telephonic communications
  5. Substation or terminal circuitry
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Off-hook disconnect and reconnect ringer device

Telephonic communications – Substation or terminal circuitry – Hold circuit
Patent

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Office line holding circuit with an automatic release function f

Telephonic communications – Substation or terminal circuitry – Hold circuit
Patent

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Office line interface circuits

Telephonic communications – Substation or terminal circuitry – Impedance matching or line equalizing
Patent

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Option bus

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

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Option bus adapter

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

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Outbound noise cancellation for telephonic handset

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

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