Dayton control relays are manufactured by Dayton Electric Manufacturing Co., operating out of Niles, Illinois. Dayton Electric is a subsidiary of W.W. Grainger, Inc. In addition to control relays, logic control relays and general purpose relays, Dayton Electric manufactures a variety of construction-related equipment.References:BBB: Dayton Electric Manufacturing Co.Old Wood-Working Machines: Dayton Electric Manufacturing CoKelly search: Dayton Electric Manufacturing Co.