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

Nicholson Pine

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Battery heating system using internal battery resistance

Electric heating – Heating devices – Combined with diverse-type art device
Patent

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Detection of multifrequency tone signals

Telephonic communications – Supervisory or control line signaling – Signal receiver
Patent

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Profile ID: LFUS-PAI-P-1203294

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