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

Benjamin Wilson Day, Jr.

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"Plug and play" telephone system

Telephonic communications – Multi-line or key substation system with selective switching... – With intercom system
Patent

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Play and plug telephone system

Telephonic communications – Multi-line or key substation system with selective switching... – With intercom system
Patent

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Profile ID: LFUS-PAI-P-1024411

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