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Inventories (Policy)
6 Months Ended
Jun. 30, 2011
Inventories  
Inventories

We use the LIFO method of valuing inventory for financial reporting purposes for most U.S. inventories. Interim LIFO calculations are based on management's estimates of expected year-end inventory levels and costs. An actual valuation of inventory under the LIFO method is made at the end of each year based on the inventory levels and costs at that time.