4. Recorders
  5. Combined with non-recording indicator or alarm
  6. Speed indicator or alarm

Wilbur F. Metcalf

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Electronic tachograph

Recorders – Combined with non-recording indicator or alarm – Speed indicator or alarm
Patent

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Event rate counter

Registers – Platform operated – Platform actuated traffic counters
Patent

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Magnetic sensor and circuit for detecting the edge of a target a

Electricity: measuring and testing – Magnetic – Displacement
Patent

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Profile ID: LFUS-PAI-P-942187

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