4. Boring or penetrating the earth
  5. Bit or bit element
  6. With helical-conveying portion
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Rock drill with hard metal drilling head

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Rock drill with helical dust conveying groove

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Rotary-percussion drill with a four-start helical shaft

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Rubble and core removal apparatus

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Soil displacement auger head for installing piles in the soil

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Twist drill

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Twist drill

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

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Twist-drill bit

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0
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