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

Ralph E. Knapp

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Calibration of a meridian seeking instrument

Geometrical instruments – Indicator of direction of force traversing natural media – Gyroscopically controlled or stabilized
Patent

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Rotating arm aiming device system

Geometrical instruments – Straight-line light ray type – Combined
Patent

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Tape measure end hook

Geometrical instruments – Distance measuring – By flexible tape
Patent

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Profile ID: LFUS-PAI-P-283141

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