4. Geometrical instruments
  5. Straight-line light ray type
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Navigation aid

Geometrical instruments – Straight-line light ray type – Horizontal angle measurer
Patent

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Navigational instruments

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

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Needle indicator for rail liner

Geometrical instruments – Straight-line light ray type – Alignment device
Patent

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Night sight with light diffraction pattern

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

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Non-handed horizontal adjustor mechanism

Geometrical instruments – Straight-line light ray type – Alignment device
Reexamination Certificate

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North finder with optical transfer provision

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

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