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Southern California Gas Company CEO Richard D. Darman poses next to one of fifty of the nation's first natural gas powered vehicles

LOS ANGELES: Southern California Gas Company CEO Richard D. Darman poses.next to one of fifty of the nation's first natural gas powered vehicles to ever roll off.an American automobile factory assembly line on September 3, 1992. The vehicles went into service today. A General Motors factory near Detroit is building 2,500 of the Sierra natural gas trucks this year. (UPI Photo/John Barr/Files)

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