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

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

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Credit card which generates a DTMF tone

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

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CRT mass-distribution, preprogrammed automatic dialing mechanism

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

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Current source and off-hook detector

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

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Custom telephone

Telephonic communications – Supervisory or control line signaling – Substation originated
Reexamination Certificate

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Cycle-modulating type of dual-tone multifrequency generator

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

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