4. Telephonic communications
  5. Telephone line or system combined with diverse electrical...
  6. Remote control

Dan M. Percival

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Premises page/intercom system utilizing telephone set component

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

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Telephone set line status display

Telephonic communications – Substation or terminal circuitry – Visual signalling
Patent

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Voice/data switch

Telephonic communications – Telephone line or system combined with diverse electrical... – Remote control
Patent

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Profile ID: LFUS-PAI-P-892739

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