 Dover's acquisition history reaches beyond the elevator industry.With a focus on diversification in the 1960s, such as the acquisition of Ohio Pattern Works & Foundry Company in 1961, came notable purchases of companies that continue to be a significant part of Dover Corporation today.The company was shorthanded to OPW, and in 1949 one of its engineers, Leonard H. Duerr, invented the automatic shutoff fuel-dispensing nozzle valve.