4. Boring or penetrating the earth
  5. Bit or bit element
  6. With helical-conveying portion

James E. Rauckhorst

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Die-cast masonry drill with leading hard insert

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

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Method of making die-cast masonry drill

Metal tools and implements – making – Blank or process – Drill
Patent

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Profile ID: LFUS-PAI-P-1347690

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