A century ago, Westinghouse Electric was the blood enemy of General Electric. Both companies diversified into consumer goods, industrial products, and TV broadcasting (GE with NBC, Westinghouse with CBS.) However, GE kept all of its businesses as a conglomerate, while Westinghouse has sold them off. Thus, there are many companies with the rights to use the Westinghouse name.
Westinghouse's major appliance business was sold to White Consolidated Industries, which renamed the brand White-Westinghouse. This is now owned by Electrolux. (Their trademark is exclusively on the WW brand.)
Siemens-Westinghouse (now just Siemens) got the electrical distribution business.
The Westinghouse circle-W and "You can be sure..." trademarks are now held by, of all companies, Viacom. Viacom owns CBS Broadcasting; CBS was the direct corporate descendent of Westinghouse Electric Corporation, after it had sold off everything else. The trademark is licensed to many different appliance companies, and to British Nuclear Fuels.