Donald H. Hockenberry

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Trafford, PA, US

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Patents Grantslast 30 patents

Information Patent Grant
Dual speed rotary vane pump
- Patent number 4,207,031
- Issue date Jun 10, 1980
- Leybold-Heraeus GmbH & Co. KG
- Alfred E. Maskrey
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...