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Zenith Data Systems Corp., a subsidiary of Zenith Electronics Corp., received a $534 million Navy contract for software and services of microcomputers over an 84-month period. 

Rockwell International Corp. won a $130.7 million Air Force contract for AC-130U gunship replacement aircraft. 

Martin Marietta Corp. was given a $29.9 million Air Force contract for low-altitude navigation and targeting equipment. 

Federal Data Corp. got a $29.4 million Air Force contract for intelligence data handling. 

