4. Fluid reaction surfaces (i.e., impellers)
  5. Specific blade structure
  6. Coating, specific composition or characteristic

Eugene J. Gratz

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Injection molded propeller

Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Coating – specific composition or characteristic
Patent

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Method of making an injection molded propeller

Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent

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