4. Pulse or digital communications
  5. Repeaters
  6. Testing

Charles L. Zahm

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Mechanism for extracting hybrid (fh/ds) spread spectrum signals

Pulse or digital communications – Repeaters – Testing
Patent

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Method and system for proximity detection and location...

Communications: electrical – External condition vehicle-mounted indicator or alarm – Transmitter in another vehicle
Reexamination Certificate

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Methods and apparatus for determining that a train has...

Data processing: vehicles – navigation – and relative location – Navigation – Employing position determining equipment
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1674365

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