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Rock drill with cutting inserts

Boring or penetrating the earth – Bit or bit element – Impact or percussion type
Patent

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Rock drill with hard metal drilling head

Boring or penetrating the earth – Bit or bit element – With helical-conveying portion
Patent

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Rock drill with helical dust conveying groove

Boring or penetrating the earth – Bit or bit element – With helical-conveying portion
Patent

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Rock drilling bit and a method of producing the same

Boring or penetrating the earth – Bit or bit element – Magnetized or with magnet
Patent

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Rock drilling tool

Boring or penetrating the earth – Bit or bit element – Bit with leading portion forming smaller diameter initial bore
Patent

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Rock drilling tool and reamer for percussive drilling

Boring or penetrating the earth – Bit or bit element – Bit with leading portion forming smaller diameter initial bore
Reexamination Certificate

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Rock drilling tool having pulsed jets

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent

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Rock drilling tool including a drill bit having a recess in a fr

Boring or penetrating the earth – Bit or bit element – Impact or percussion type
Patent

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Rock drilling tool with radially extendable two-piece reamer

Boring or penetrating the earth – Bit or bit element – Bit with leading portion forming smaller diameter initial bore
Patent

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Rock drilling tool, drill bit and a method of transferring percu

Boring or penetrating the earth – Bit or bit element – Impact or percussion type
Patent

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Rock working tool

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent

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Rock-breaking implement for percussive machines

Boring or penetrating the earth – Bit or bit element – Impact or percussion type
Patent

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Rock-breaking tool for percussive-action machines

Boring or penetrating the earth – Bit or bit element – Impact or percussion type
Patent

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Rock-drilling bit for percussion hammers

Boring or penetrating the earth – Bit or bit element – Plural separable cutter elements
Patent

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Rockbit with attachable device for improved cone cleaning

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Reexamination Certificate

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Roller ball retention of reamer cutter assembly

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent

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Roller bit

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent

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Roller bit parallel inlayed compacts

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Reexamination Certificate

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Roller bit seal excluded from cuttings by air discharge

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent

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Roller bit with a journal pin offset from the central axis...

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Reexamination Certificate

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