4. Telephonic communications
  5. Supervisory or control line signaling
  6. Using line or loop condition detection

Jeffrey M. Davis

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Combined loop current sink, battery detector, and ringing detect

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
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Method and apparatus for image processing using weighted...

Television – Camera – system and detail – Combined image signal generator and general image signal...
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Data processing: database and file management or data structures – Online transactional processing system
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