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

Yechiel Rosenfeld

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Apparatus for remotely determining hook status conditions

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
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Tone-responsive circuit for activating an instrumentality interf

Telephonic communications – Emergency or alarm communications – Responsive to sensed nonsystem condition
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Profile ID: LFUS-PAI-P-1603158

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