4. Cutting by use of rotating axially moving tool
  5. Tool or tool with support
  6. Having stepped cutting edges

John D. Knox

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Drill bit blade for masonry and rock drill

Cutting by use of rotating axially moving tool – Tool or tool with support – Having stepped cutting edges
Patent

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Drill having means for locating cutting bit in a bit holder

Boring or penetrating the earth – Bit or bit element – Plural separable cutter elements
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Profile ID: LFUS-PAI-P-122295

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