4. Boring or penetrating the earth
  5. Bit or bit element
  6. Impact or percussion type

Teijo Hulkkonen

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Bit assembly for a hammering drill

Boring or penetrating the earth – Bit or bit element – Adjustable cutter element
Reexamination Certificate

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Drilling device for drilling and reaming of a hole

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by cam or gear axially rotatable...
Reexamination Certificate

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Method for mounting hard metal buttons in a drill bit

Boring or penetrating the earth – Bit or bit element – Impact or percussion type
Patent

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Profile ID: LFUS-PAI-P-109923

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