4. Telephonic communications
  5. Supervisory or control line signaling
  6. Signal reception at substation

David Irwin Lappen

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Display device for both hardcopy and digital images

Optical: systems and elements – Projection screen
Reexamination Certificate

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Method and apparatus for monitoring video signals in a computer

Boots – shoes – and leggings
Patent

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Method and apparatus for monitoring video signals in a computer

Computer graphics processing and selective visual display system – Display driving control circuitry – Controlling the condition of display elements
Patent

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Remote telephone ringer controller

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent

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Profile ID: LFUS-PAI-P-1076103

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