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SU1745860A1
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Dual roller-cutter drilling bit
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Drilling diamond crown bit
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Flushing unit for drill bit
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Diamond crown bit
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Drill bit for drilling with continuous core lifting
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Drilling bit flushing assembly
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Crown bit
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Flushing assembly of drilling bit
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Two-cone drilling bit
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Bit for boring with continuous evacuation of core
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Drilling bit flushing unit
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Device for cuttings protection and lubrication of roller cutter bit bearing
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Device for difficult drilling conditions
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Downhole seal
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SU1606690A2
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Downhole seal
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Flushing unit of drill bit
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Drilling roller bit
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Support of rolling cutter bit
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Drilling bit
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Diamond rock-breaking tool
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