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

Armin Olschewski

E - Fixed Constructions – 21 – B

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Inventor

Country: Germany

Roller-bit with tapered cutting rolls

E - Fixed Constructions – 21 – B
Patent

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Rotary drill bit with rotary cutter

E - Fixed Constructions – 21 – B
Patent

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Rotary drill bit with rotary cutter

E - Fixed Constructions – 21 – B
Patent

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Rotary drill bit with rotary cutters

E - Fixed Constructions – 21 – B
Patent

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Profile ID: LFCA-PAI-P-570514

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