4. Telephonic communications
  5. Centralized switching system
  6. Switching controlled in response to called station...

Teltrend Inc.

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Adjustable hybrid having improved biasing configuration

Telephonic communications – Subscriber line or transmission line interface – Hybrid circuit
Patent

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AGC amplifier for two-wire line conditioner

Telephonic communications – Repeater – With gain or attenuation control
Patent

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Bridge for a network interface unit

Telephonic communications – Subscriber line or transmission line interface
Patent

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Caller identification transmit path limiter

Telephonic communications – Subscriber line or transmission line interface
Patent

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Data transmission protection circuit with error correction

Excavating
Patent

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