Sparton Corporation · Schaumburg, IL United States ·(NYSE: SPA)

This Sparton has far more than 300 people to defend its turf. The company and its subsidiaries provide contract electronics manufacturing services -- ranging from printed circuit boards and electromechanical devices to box build (fully-built) systems -- for corporate and government markets, such as aerospace, defense, medical, and scientific instrumentation markets. Sparton specializes in electronics outsourcing. The company also offers engineering services, including printed circuit board design and software development, and it makes sonobuoys (devices that detect submarines). Major customers include Bally, Siemens Diagnostics, and the US Navy; the US government accounts for about 20% of revenue. To read the full description, subscribe now.