4. Boring or penetrating the earth
  5. With tool drive prime mover or above-ground mechanical...
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Kelly bar having hardened flutes

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – Rotary drive for a relatively advancing tool
Patent

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Kelly bushing guard

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – Rotary drive for a relatively advancing tool
Patent

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Kelly driver

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – Rotary drive for a relatively advancing tool
Reexamination Certificate

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Kelly saver drive

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – Rotary drive for a relatively advancing tool
Patent

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