David D. Ferris

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Pittsburgh, PA, US

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Patents Grantslast 30 patents

Information Patent Grant
Process and apparatus for cleaning very fine ore
- Patent number 4,028,228
- Issue date Jun 7, 1977
- Heyl & Patterson, Inc.
- David D. Ferris
- B03 - SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES O...