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paperback. Condizione: New. Pub Date :2006-07-01 Pages: 155 Publisher: China Labor and Social Security Publishing House Contents: the module wire rope of the rigging and spreader of the first unit the first module hemp second third module spreader exercises second unit commonly used since heavy tools and small lifting equipment module tackles and tackles the second module chain hoist and electric hoist module jack module winch the fifth module hoist exercises classification of the third unit of the first module crane li.