Donald B. Johnson

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Litchfield, NH, US

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Patents Grantslast 30 patents

Information Patent Grant
Pulp centrifugal pump
- Patent number 4,770,604
- Issue date Sep 13, 1988
- Ingersoll-Rand Company
- Oscar Luthi
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...