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WO2008070454A2
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Proximity detection system
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US6214057B1
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Overload protection device for robotic tooling
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FR1519039A
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Improved method and apparatus for adjusting the working height of graders and the like
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US3437825A
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Distance measurer using converging sight beams and movable photoreceptors
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GB1156072A
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Improvements in or relating to Survey Reference Apparatus and the Methods of Control Thereof.
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US3471234A
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Laser beam projector for surveying operations
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US3494426A
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Method and apparatus for controlling elevation of graders and similar equipment
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US3527539A
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Method and apparatus for indicating center of radiant energy beam
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CA822370A
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Method and apparatus for establishing a surveying reference plane
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CA842480A
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Method and apparatus for controlling elevation of graders and terrain leveling equipment
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