4. Boring or penetrating the earth
  5. Enlargement of existing pilot throughbore requiring...

Roger F. Masse

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Apparatus for drilling hard material

Boring or penetrating the earth – Enlargement of existing pilot throughbore requiring...
Patent

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Drill head with integral impact hammers

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

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Sleigh shaped device for mining raises

Fire escape – ladder – or scaffold – Platform with elevating or lowering means – Suspended
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1367036

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