4. Telephonic communications
  5. Repeater
  6. Pulse or tone repeater
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Communication system tonal component maintenance techniques

Telephonic communications – Repeater – Pulse or tone repeater
Reexamination Certificate

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Digital circuit for conditional initialization

Telephonic communications – Repeater – Pulse or tone repeater
Patent

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Electromagnetic relay used in a telephone exchange or the...

Telephonic communications – Repeater – Pulse or tone repeater
Reexamination Certificate

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Pulse receiver circuit providing longitudinal balance

Telephonic communications – Repeater – Pulse or tone repeater
Patent

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Telephone having improved hands free operation audio quality...

Telephonic communications – Repeater – Pulse or tone repeater
Reexamination Certificate

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Transmission of a clock by a capacitive isolating barrier

Telephonic communications – Repeater – Pulse or tone repeater
Reexamination Certificate

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