The U.S. company won a two-month battle to buy into Britain's only helicopter maker, ending a bidding rivalry that rocked Prime Minister Margaret Thatcher's Cabinet with the resignations of two top ministers. Shareholders of Westland PLC voted 67.8% in favor of accepting the bid led by Sikorsky in partnership with Fiat S.p.A. of Italy, in effect rejecting a bid by a consortium of British and European aircraft makers. Sikorsky-Fiat will have 21% of Westland stock. No money figures were immediately available. Sikorsky, a subsidiary of United Technologies, and Fiat are expected to inject about $110 million into financially troubled Westland.