Machinery supplier Diversified Systems Inc. has hired Harold Yoder as field service director and Gary Cooper as senior technician with its Technical Service Group. Yoder reports to company President Eddie Burgess; Cooper reports to Yoder. Both men previously were with Marshall & Williams Co. and Navis Global (formerly Tube–Tex) and, together, have more than 60 years of experience working with tenter chains, frames, ovens and all types of finishing machinery. Diversified Systems, which produces equipment for the textile, cut–and–sew, nonwoven and film industries, is based in Greenville, S.C.