4. Tool driving or impacting
  5. Advance causing or controlling means
  6. Motor causes or controls advance

The Richmond Manufacturing Company

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Directional control mechanism for underground driven pipes and c

Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along...
Patent

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Portable earth boring machine

Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Patent

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Portable earth boring machine

Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Patent

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Portable earth boring machine

Boring or penetrating the earth – Automatic control
Patent

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Portable earth boring machine

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

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