John M. Keller

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Canvas, WV, US

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Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for monitoring liquid level in a container
- Patent number 6,502,461
- Issue date Jan 7, 2003
- John M. Keller
- G01 - MEASURING TESTING

Patents Applicationslast 30 patents

Information Patent Application
Method and apparatus for monitoring liquid level in a container
- Publication number 20010032506
- Publication date Oct 25, 2001
- John M. Keller
- G01 - MEASURING TESTING