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New Microcircuit Companies—A new company to specialize in semiconductor microcircuits has been set up in the San Francisco Bay region and another one may follow shortly. Stewart-Warner Inc., a subsidiary of Stewart-Warner Corp., will be located in Sunnyvale, Calif., and headed by Don Potter, rice president and general manager of Stewart-Warner’s Electronics Div. Dual executive vice presidents will be Bill Hugle, formerly with Siliconix, and Ken Brunsman of Stewart-Warner.