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John J. Hoefner
John J. Hoefner is a mechanical consultant specializing in reciprocating and centrifugal compressors, engines, turbines, and pumps. He is the former chief engineer of Worthington S...voir plusJohn J. Hoefner is a mechanical consultant specializing in reciprocating and centrifugal compressors, engines, turbines, and pumps. He is the former chief engineer of Worthington Service Corporation.voir moins