4. Communications: directive radio wave systems and devices (e.g.,
  5. Directive
  6. Including a satellite

William Matheson

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Application of GPS to a railroad navigation system using two sat

Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent

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Yard tracking system

Railway switches and signals – Train-position indication – Train annunciators or indicators
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1251574

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