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Book Description paperback. Condition: New. Ship out in 2 business day, And Fast shipping, Free Tracking number will be provided after the shipment.Paperback. Pub Date :2012-01-01 Pages: 64 Publisher: Coal Industry Press predict the risk of coal miners underground operations and preventive measures ( mechanical and electrical maintenance chapter ) to combine pictures and commentary in the form of text . pursuant to and under specific operating environment to work projects as a unit. in-depth analysis of the various operating potential risk factor . given targeted preventive measures to facilitate the safe operation of underground workers.Four Satisfaction guaranteed,or money back. Seller Inventory # BR034303