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Drill shoe

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

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Drilling bit

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

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Drilling head of a rotary impact drill

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

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Earth boring cutting element retention system

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

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Excavation tool

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

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Hole opener assembly and a cone arm forming a part thereof

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

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Impact bit having circumferential inserts of differing combinati

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

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Insert for a mine tool roof bit and a method of drilling therewi

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

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Insert for drill bits and drill stabilizers

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

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Insert with locking projection

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

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Inserts having two components anchored together at a non-perpend

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

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Locking device for hard metal inserts

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

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Mechanically fastened center vacuum roof drill bit

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

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Metal insert mounting

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

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Method and apparatus for mounting PCD compacts

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

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Mining drill

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

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Mining drill

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

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Mining drill

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

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Mining drill

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

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Mining drill

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

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