4. Communications: electrical
  5. Condition responsive indicating system
  6. Specific condition

George E. Rollins

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Apparatus and methods for an inductive proximity sensor

Electricity: measuring and testing – Magnetic – Displacement
Reexamination Certificate

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Apparatus and methods for proximity sensing circuitry

Electricity: measuring and testing – Magnetic – Displacement
Reexamination Certificate

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Audit trail in a programmable safety instrumented system via...

Electrical computers and digital processing systems: support – System access control based on user identification by... – Using record or token
Reexamination Certificate

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Electronic token to provide sequential event control and...

Communications: electrical – Selective – Interrogation response
Reexamination Certificate

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Method for using a single optical emitter/receiver pair for...

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate

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Profile ID: LFUS-PAI-P-980315

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