Edwin R. Langill

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Pepperell, MA, US

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Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for maintaining level of water in above-ground...
- Patent number 5,358,003
- Issue date Oct 25, 1994
- Edwin R. Langill
- G05 - CONTROLLING REGULATING
Information Patent Grant
Method and apparatus for maintaining level of water in above-ground...
- Patent number 5,253,374
- Issue date Oct 19, 1993
- Edwin R. Langill
- G05 - CONTROLLING REGULATING
Information Patent Grant
Method and apparatus for maintaining level of water in above-ground...
- Patent number 5,154,205
- Issue date Oct 13, 1992
- Edwin R. Langill
- G05 - CONTROLLING REGULATING