4. Geometrical instruments
  5. Straight-line light ray type
  6. Vertical and horizontal angle measurer

Mark H. McKeown

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Geological gyrocompass

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

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Laser goniometer

Geometrical instruments – Straight-line light ray type – Vertical and horizontal angle measurer
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Pyramid beam splitter

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

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Radial arm strike rail

Patent

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Profile ID: LFUS-PAI-P-245532

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