4. Machines not elsewhere specified
  5. Material working, abrading, or founding machinery
  6. Element or attachment

Steven B. Mason

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Exterior wiper head for drill pipe

Machines not elsewhere specified – Material working – abrading – or founding machinery – Element or attachment
Patent

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Pipe wiper assembly for a well drilling unit

Boring or penetrating the earth – With above-ground cleaner for boring means
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Profile ID: LFUS-PAI-P-1124281

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