4. Geometrical instruments
  5. Straight-line light ray type
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Device for determining true bearing during daytime

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

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Device for locating celestial bodies

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

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Device to locate communication satellites

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

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Direction indicator

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

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Diurnal solar event triggering mechanism

Geometrical instruments – Straight-line light ray type – Celestial
Reexamination Certificate

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