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JPH01131782A
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Axially combining/holding device of cutter for rotary drilling bit
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JPS63261092A
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Shaft sealing device for cutter of drill bit
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JPS62296090A
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Rotary shaft seal apparatus for cutter of drill bit
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JPS61207784A
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Lubricant feeder for rock bit
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JPS61207785A
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Lubricant feeder for rock bit
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JPS5967363A
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Production of journal bearing in rotary cutter for bit
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JPS5967364A
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Production of journal bearing in rotary cutter for bit
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JPS597522A
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Cutter for simultaneously fluting three spiral grooves onto digging drill collar
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JPS58163867A
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Seal ring
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US4407375A
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Pressure compensator for rotary earth boring tool
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US4392534A
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Composite nozzle for earth boring and bore enlarging bits
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JPS57197392A
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Bearing structure of rotary drilling tool
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JPS57190894A
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Piston type lubrication and pressure compensator in excavating bit
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JPS57174591A
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O-ring for oil well drilling bit
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JPS57108388A
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Compound nozzle for bit and expansion bit
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US4113290A
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Pressure tight joint for a large diameter casing
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JPS5280201A
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Bracket type cutter bit
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JPS5272306A
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Method of implanting very hard edge piece of insert bit
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JPS5257515A
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Pressure resisting joint for pipe with big diameter
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JPS514002A
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Rooraabitsutoyo jikukefusahoho oyobi sochi
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