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Apparatus and method for north referenced direction surveying
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Apparatus and method
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WO0025089A1
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Apparatus and method for obtaining 3d images
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Survey apparatus
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Survey apparatus and method
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Survey apparatus and method
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US5940172A
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Surveying apparatus
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Survey apparatus
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Surveying apparatus
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Surveying apparatus
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Improvements in or relating to telemetry
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Improvements relating to blasting method
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Improved apparatus and methods for surveying boreholes
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Hand-held laser rangefinder
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Measuring borehole derivation
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