4. Boring or penetrating the earth
  5. With means to feed drive

J. Richard England

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Directional drilling apparatus

Boring or penetrating the earth – With means to feed drive
Patent

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Spherical reaming bit

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

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Spherical reaming bit

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

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Underground mining system

Boring or penetrating the earth – With above-ground means for preparing or separating drilling...
Patent

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Profile ID: LFUS-PAI-P-481894

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