4. Geometrical instruments
  5. Indicator of direction of force traversing natural media
  6. Level or plumb, terrestrial gravitation responsive

Keith E. Barr

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Inclination sensor

Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
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Method for improving the received signal to noise ratio of a...

Optics: measuring and testing – Range or remote distance finding – With photodetection
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