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(A patent for invention 1)Heat treatment method of tooth claw of tricone bit
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(A patent for invention 2)Vacuum oil injection method
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(A patent for invention 3)Heat treatment process of cone bit
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(A patent for invention 4)jacking rock crushing method
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(A patent for invention 5)The utility model relates to a multi-head three-cone drill head pipe machine cutter head
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(A patent for invention 5)The utility model relates to a multi-head three-cone drill head pipe machine cutter head
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Mining roller bit
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The utility model relates to a roller bit with a check valve
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The utility model relates to a three-cone bit with a wear-resistant journal
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The utility model relates to a rolling bearing for a roller cone bit
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The utility model relates to a carbide insert tooth cone bit
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The utility model relates to an axially sealed cone bit
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Carbide tooth and mining roller bit
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Vacuum filling nozzle and vacuum filling system
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The utility model relates to a detachable engineering cone bit
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A tricone bit without a central nozzle seat
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A multi-head cutting gear
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The utility model relates to a split type heat treatment furnace fan
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The utility model relates to a bolted connected engineering drill bit (Utility model patent)
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Quality management system certification(Chinese)
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Quality management system certification(English)
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Hubei famous brand
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Invention Patent
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High-tech enterprise
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