4. Radiant energy
  5. Photocells; circuits and apparatus
  6. Optical or pre-photocell system

Hans-Rudolf Ammann

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Conduit construction laser system and laser beam receiver

Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent

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Laser beam levelling device

Optics: measuring and testing – Fiducial instruments – Artificial reference
Patent

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Laser beam levelling device

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent

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Laser beam levelling device and process for operating a laser be

Optics: measuring and testing – Fiducial instruments
Patent

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Laser beam levelling instruments

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

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Profile ID: LFUS-PAI-P-953032

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