4. Telephonic communications
  5. Supervisory or control line signaling
  6. Signal reception at substation
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Light controlled telephone ringer

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent

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Light emitting diode message waiting lamp circuit

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent

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Line circuit for driving a ringer and a service indicating lamp

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent

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Line-powered detection of call progress tones

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent

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