Charles E. Johnson

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Santa Ana, CA, US

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Patents Grantslast 30 patents

Information Patent Grant
Variable differential pressure unloading valve apparatus
- Patent number 4,164,342
- Issue date Aug 14, 1979
- Double A Products Company
- Charles E. Johnson
- G05 - CONTROLLING REGULATING
Information Patent Grant
Variable differential pressure unloading valve apparatus
- Patent number 4,114,637
- Issue date Sep 19, 1978
- Double A Products Company
- Charles E. Johnson
- G05 - CONTROLLING REGULATING