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The interference involved a two-week period when Mr. Bryant had given notice about leaving Mattel, but was still working there while helping MGA create the doll. MGA has maintained it did not know Mr. Bryant was still working at Mattel.

In its case, El Segundo, Calif.-based Mattel contended that Mr. Bryant developed the dolls while working for Mattel in 1999 and secretly took the idea to MGA, which developed the first-generation fashion dolls while obscuring Mr. Bryant’s involvement.

MGA denied the allegations and countersued, contending the Barbie-maker engaged in corporate espionage and unfair business practices when it realized it couldn’t compete against the smaller company’s blockbuster toy.

MGA contended Mattel stole trade secrets, including information about future Bratz products, by sending spies with fake IDs to toy fairs so they could bolster Mattel products aimed at “tween” girls ages 9 to 11.