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Boring or penetrating the earth
Bit or bit element
Cutting edge self-renewable during operation
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Impregnated drill bits with adaptive matrix
Boring or penetrating the earth – Bit or bit element – Cutting edge self-renewable during operation
Patent
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Impregnated rotary drag bit
Boring or penetrating the earth – Bit or bit element – Cutting edge self-renewable during operation
Reexamination Certificate
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