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Librería: liu xing, Nanjing JiangSu, JS, China
paperback. Condición: New. Pub Date :2006-07-01 Publisher: China Machine Press book in the second edition based on a comprehensive amendment. supplement computer basics and microcomputer control elevator. drag the elevator. permanent magnet synchronous motor (VVVF) automatic escalators and moving walkways structure principle and standards. regulations on elevator new products. industry requirements. make the content more systematically improve immediately after the current national standards and policies. principles an.