4. Expansible chamber devices
  5. Piston
  6. Open-ended hollow skirt type

Thomas J. Skingle

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Die-cast masonry drill with leading hard insert

Boring or penetrating the earth – Bit or bit element – With helical-conveying portion
Patent

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Method of making die-cast masonry drill

Metal tools and implements – making – Blank or process – Drill
Patent

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Reinforced piston

Expansible chamber devices – Piston – Open-ended hollow skirt type
Patent

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Profile ID: LFUS-PAI-P-1023421

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