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EP0429649A1
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Drilling installation
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DE1623123A1
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Procedure for geophysical exploration of ore deposits
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DE1483796A1
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Automatic machine for lowering and pulling up a drill rod
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GB1150319A
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Apparatus for Automatic Pulling and Running of Drilling String.
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CA815670A
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Induced pulse transient system
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CA804153A
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Apparatus for radio-wave examination of rocks
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CA837452A
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Device for automatic pulling and running of drilling string
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CA875162A
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Apparatus for geophysical prospecting of ore deposits
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CA910408A
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Method of geophysical prospecting of ore deposits
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