Hundreds of former light bulb factory workers who say they were exposed to mercury, arsenic and other toxic chemicals sued Philips Lighting Co. and several other companies Tuesday...The previous owners - Westinghouse Electric Corp., which opened the factory in 1941, and its successor, Viacom Inc. - are named as co-defendants, along with West Virginia chemical suppliers Chem Quick, Par Chem, Blue Ribbon Paint Co. and Charleston Valve and Fitting Co.