View driving directions >   2533 Technical Drive P.O. Box 808 Miamisburg, Ohio 45343 Phone: (937) 859-5955 Fax: (937) 859-5954 Email:   David Vickroy President dvickroy@hartzellmfg.com   Randy Schneck Engineering randy@hartzellmfg.com   Nancy Boles Accounting Manager nboles@hartzellmfg.com   Mike Alspaugh Operations Manager mike@hartzellmfg.com   Fred Issenmann Quality Manager fredi@hartzellmfg.com   Crystal Morgan Customer Service crystal@hartzellmfg.com   Carol Middleton Purchasing Secretary carolm@hartzellmfg.com