4. Tool driving or impacting
  5. Impacting devices
  6. Selective axial direction of impact

Jon A. Haas

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Dual-diameter pneumatic ground piercing tool

Boring or penetrating the earth – Boring without earth removal
Patent

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Method for installing a pavement underdrain

Road structure – process – or apparatus – Drain or gutter
Patent

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Method for making a pneumatic ground piercing tool

Metal working – Method of mechanical manufacture – Assembling or joining
Patent

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Pneumatic ground piercing tool

Tool driving or impacting – Impacting devices – Selective axial direction of impact
Patent

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Pneumatic ground piercing tool with detachable head

Tool driving or impacting – Impacting devices – Selective axial direction of impact
Patent

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Profile ID: LFUS-PAI-P-297652

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