El Segundo-based Computer Sciences Corp. said it...

El Segundo-based Computer Sciences Corp. said it completed the sale of 40% of its ownership shares in its Infonet subsidiary to the telecommunications authorities of four European countries . . . PI Acquisition Corp. has extended its $25-per-share tender offer for Santa Cruz-based Plantronics Inc. until Sept. 14, according to a filing with the SEC . . . A shareholder of Rolling Meadows, Ill.-based Gould Inc. filed a lawsuit in the Delaware Chancery Court on Sept. 1 to block the $23.25-a-share tender offer by Nippon Mining U.S. Inc., according to an SEC filing.