4. Boring or penetrating the earth
  5. Bit or bit element
  6. Impact or percussion type

Werner Ferstl

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Cutting metal alloy for shaping by electrical discharge...

Alloys or metallic compositions – Tungsten base – Carbon – boron or nitrogen containing
Reexamination Certificate

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Drill bit

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

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Profile ID: LFUS-PAI-P-1608045

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