4. Fluid reaction surfaces (i.e., impellers)
  5. Specific working member mount
  6. Welded, cemented or fused

John Robert Kelley

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Fluid reaction surfaces (i.e. – impellers) – Specific working member mount – Welded – cemented or fused
Reexamination Certificate

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Friction stir welded hollow airfoils and method therefor

Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Hollow
Reexamination Certificate

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