4. Telephonic communications
  5. Call or terminal access alarm or control
  6. At switching center

Tae-Gyu Lee

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Apparatus and method for providing music-on-hold service in...

Telephonic communications – Multi-line or key substation system with selective switching... – Detail of hold circuitry
Reexamination Certificate

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Method for controlling long distance calling using a multi-frequ

Telephonic communications – Call or terminal access alarm or control – At switching center
Patent

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Profile ID: LFUS-PAI-P-1010791

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