4. Telephonic communications
  5. Plural exchange network or interconnection
  6. Multi-pbx interconnection

Choon-Ho Yoo

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Method of and apparatus for networking a plurality of private br

Telephonic communications – Plural exchange network or interconnection – Multi-pbx interconnection
Patent

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Multiple subscriber implementing method in key phone system

Telephonic communications – Multi-line or key substation system with selective switching... – Switching or supervision feature
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Profile ID: LFUS-PAI-P-780002

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