Spencer L. Hermanson

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Crescendo telephone ringer

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

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DTMF Signal receiver

Patent

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Electronic programmer for telephones with auto-dial

Telephonic communications – Special services – Abbreviated dialing or direct call
Reexamination Certificate

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High voltage message waiting circuit

Telephonic communications – Substation or terminal circuitry – Visual signalling
Patent

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Low power line selection circuit for a telephone

Telephonic communications – Subscriber line or transmission line interface – Power supply
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1380280

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