Hella North America plans to invest more than $20-million for a new assembly line to produce electronic throttle-control systems at the company's North American headquarters and manufacturing complex in Plymouth, MI. Joseph V. Borruso, Hella's North American president and CEO, said the new line will be installed and in full operation by the first quarter of 2001. The production facility, he added, will create up to 50 new jobs and occupy approximately 1,500-square-feet.