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Teradyne Inc., the No. 1 maker of semiconductor-testing equipment, said it will fire about 650 people and cut pay for senior managers because customers are buying fewer products and services. . . . Adaptec Inc., a maker of cards that speed computer connections, said it will cut 450 jobs, or 20% of its work force, because of slowing sales. . . . Online learning company ECollege warned of a wider-than-expected loss and announced it will lay off 35 of its 330 workers.