4. Telephonic communications
  5. Special services
  6. Conferencing

Barry J. Weinbaum

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Message signaling arrangement between a switching system and use

Telephonic communications – Special services – Conferencing
Patent

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Station set directory assistance arrangement

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Profile ID: LFUS-PAI-P-1025534

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