4. Telephonic communications
  5. Supervisory or control line signaling
  6. Using line or loop condition detection
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Half-duplex controller

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

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Half-duplex speakerphone

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

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Hands-free speaking device with echo canceler

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

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Hands-free telephone apparatus

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

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High impedance polarity detector

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

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High voltage detection circuit, bell signal detection circuit an

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

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Hybrid circuit for an electric operating and scanning interface,

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

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