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

Inventa Electronics Co., Ltd.

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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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Automatic telephone answering device with multiple outgoing mess

Telephonic communications – Audio message storage – retrieval – or synthesis – Dynamic audio signal recording or reproduction
Patent

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Controllable annunciator using ring signal

Telephonic communications – Call or terminal access alarm or control – At substation
Patent

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Electronic device for providing information related to an input

Telephonic communications – Supervisory or control line signaling – Substation originated
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