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

Christiaan Ligtenberg

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Automatic level and plumb tool

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

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Automatic level and plumb tool

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

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Automatic level and plumb tool

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

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Automatic level and plumb tool

Optics: measuring and testing – Angle measuring or angular axial alignment – Apex of angle at observing or detecting station
Patent

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Co-linear and intersecting five light beam generator

Optical: systems and elements – Single channel simultaneously to or from plural channels
Patent

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Profile ID: LFUS-PAI-P-560695

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