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Book Description paperback. Condition: New. Paperback. Pub Date: 2017-07-01 Language: Chinese publisher: China Railway Publishing house Railway turnout switch Machine to the development of China's switch machine. basic technical conditions and switch machine structure. principle. technical parameters are described in detail. The main contents include: Early switch equipment. switch equipment after speed increase. the basic technical conditions of China's switch machine. Seller Inventory # DP048558