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San Diego-based Foodmaker Inc., operator and franchiser of Jack in the Box restaurants, reported fiscal second-quarter earnings of $6.7 million, or 17 cents per share, compared with $4 million, or 10 cents, a year ago. . . . Los Angeles-based Mercury Air Group Inc. said fiscal third-quarter net income rose 29% to a record $1.1 million, or 13 cents per share, compared with $877,000, or 11 cents, in the year-ago quarter. . . . Torrance-based Summa Industries and Chatsworth-based Calnetics Corp. said they have mutually agreed to terminate their previously announced deal to merge Calnetics with a subsidiary of Summa.