4. Telephonic communications
  5. Substation or terminal circuitry
  6. Amplifying

Rickey R. Walker

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Non-volatile automatic telephone number dialer circuit

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

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Universal telephone handset interface

Telephonic communications – Substation or terminal circuitry – Amplifying
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Profile ID: LFUS-PAI-P-541348

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