4. Telephonic communications
  5. Multi-line or key substation system with selective switching...
  6. With special service

Bret A. Cooper

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Interexchange carrier automatic route selection system

Telephonic communications – Plural exchange network or interconnection – Connection call model
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Key telephone management system

Telephonic communications – Multi-line or key substation system with selective switching... – With special service
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Profile ID: LFUS-PAI-P-338194

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