4. Boring or penetrating the earth
  5. With tool shaft detail
  6. Helix or helically arranged structure

Helmut Duscha

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Multi-purpose drilling tool

Boring or penetrating the earth – With tool shaft detail – Helix or helically arranged structure
Reexamination Certificate

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Multi-purpose drilling tool

Boring or penetrating the earth – With tool shaft detail – Helix or helically arranged structure
Reexamination Certificate

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Rock drill

Boring or penetrating the earth – With tool shaft detail – Helix or helically arranged structure
Reexamination Certificate

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Rotary impact drill bit

Machines not elsewhere specified – Material working – abrading – or founding machinery – Element or attachment
Design Patent

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Profile ID: LFUS-PAI-P-2264851

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