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GB8812873D0
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Drilling or coring tool
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GB8808487D0
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Cutters for use in drilling bits
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GB8808490D0
|
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Drilling tool
|
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GB8715207D0
|
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Drilling/coring tool
|
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GB8713702D0
|
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Drilling tool
|
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GB8519905D0
|
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Rotary grinding wheel dressers
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GB1574343A
|
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Hydraulic drive arrangement
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GB1572543A
|
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Drilling tools
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DE2554240A1
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Expansion packer for bore holes - has rubber sleeve expanded by compressed air around mandrel, attached to packer housing
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DE2443094A1
|
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Expansion packer for oil wells - with ends of expandable sleeve vulcanised into circular slots over tubular mandrel
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DE1533631A1
|
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Drill bits
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ES341418A1
|
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Improvements in diamond points for barrels or similar. (Machine-translation by Google Translate, not legally binding)
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US3433331A
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Diamond drill bit
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