4. Boring or penetrating the earth
  5. With above-ground means to impact an earth-penetrating means

Carl G. B. Ekwall

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Pneumatic drill lubricator

Tool driving or impacting – Impacting devices – With means for rotating tool
Patent

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Rock drilling apparatus

Boring or penetrating the earth – With above-ground means to impact an earth-penetrating means
Patent

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Rock drilling apparatus

Tool driving or impacting – Impacting devices – With means for rotating tool
Patent

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Rock drilling apparatus with noise reducing drill rod cover

Boring or penetrating the earth – With tool shaft detail
Patent

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Profile ID: LFUS-PAI-P-307573

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