4. Telephonic communications
  5. Substation or terminal circuitry
  6. Visual signalling

Charles Nickerson

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Apparatus and method for measuring mechanical properties

Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Reexamination Certificate

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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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Profile ID: LFUS-PAI-P-1415430

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