Ronald Trammell

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Tomball, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Unitized spherical profile check valve with replaceable sealing ele...
- Patent number 6,227,240
- Issue date May 8, 2001
- National-Oilwell L.P.
- Samuel S. Wu
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...