Whittaker Corp. reported that it has acquired Lee Telecommunications, a closely held manufacturer of military command, control and communications systems, for undisclosed terms . . . Loews said it has raised its stake in CBS to 19.7%, up from 17.7% . . . System Integrators of Sacramento announced that it has signed a $3.53-million contract with the San Jose Mercury-News for an editorial pagination system . . . MCI said it has started to provide long-distance service to Spain and Singapore.