4. Telephonic communications
  5. Supervisory or control line signaling
  6. Substation originated

R. P. Marley

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Free-space optical switching apparatus

Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent

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Method for selectively controlling the propagation of dual-tone

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Profile ID: LFUS-PAI-P-1006439

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