4. Telephonic communications
  5. Supervisory or control line signaling
  6. Using line or loop condition detection
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Parallel off hook detector for electronic remote data recorder

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

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Parallel phone detection circuit

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

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Phone busy circuit

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

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Precision FET control loop

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

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Process and apparatus for control of a hands-free telephone set

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

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Processes and systems for screening work orders

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

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