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Two-wire intercom with hands-free function

Telephonic communications – Private or single line system – Lockout
Patent

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Two-wire telecommunications line detection arrangements

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent

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Two-wire telecommunications line detection arrangements

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent

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Two-wire termination impedance generation circuit of subscriber

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

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Two-wire to four-wire switching exchanger

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

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Two-wire/four wire communication interface with noise rejection

Telephonic communications – Repeater – Component processes bidirectional signals
Patent

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Two-wire/four-wire converter

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

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Two-wire/four-wire converter

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

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