4. Telephonic communications
  5. Supervisory or control line signaling
  6. Signal receiver

James C. Mason

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Efficient digital ITU-compliant zero-buffering DTMF...

Telephonic communications – Supervisory or control line signaling – Signal receiver
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Efficient digital ITU-compliant zero-buffering DTMF...

Telephonic communications – Supervisory or control line signaling – Signal receiver
Reexamination Certificate

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Methods of placing, purchasing and monitoring internet...

Data processing: financial – business practice – management – or co – Automated electrical financial or business practice or... – Discount or incentive
Reexamination Certificate

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