4. Telephonic communications
  5. Private or single line system
  6. Doorbell system

Michael R. Collingwood

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Method and system for measuring the volume loss of a metal...

Electricity: measuring and testing – Magnetic – Calibration
Reexamination Certificate

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Portable through-door intercom

Telephonic communications – Private or single line system – Doorbell system
Patent

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Quantification method and system for corrosion and damage...

Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1403931

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