4. Telephonic communications
  5. Special services
  6. Abbreviated dialing or direct call

Kou-I Yeh

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Apparatus for timely controlling the sound characteristic of a s

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

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Apparatus for timely controlling the sound characteristic of a s

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

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Hot-line device for telephone sets

Telephonic communications – Special services – Abbreviated dialing or direct call
Patent

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Switching control apparatus for intercom-telephone sets

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Patent

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Profile ID: LFUS-PAI-P-343089

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