4. Geometrical instruments
  5. Straight-line light ray type
  6. Alignment device

Evan Lloyd Hopkins

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Fluid condition monitoring system

Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent

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Orientation detection and alignment method and apparatus

Geometrical instruments – Straight-line light ray type – Alignment device
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Profile ID: LFUS-PAI-P-820577

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