4. E - Fixed Constructions
  5. 21
  6. B

Kalevi Helasuo

E - Fixed Constructions – 21 – B

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Inventor

Country: Finland

Means for sharpening a studded rock drill crown

B - Operations – Transporting – 24 – B
Patent

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Method employed in deep hole drilling and a drill shaft system

E - Fixed Constructions – 21 – B
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Profile ID: LFCA-PAI-P-1213277

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