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Pb Ratio History for National-Oilwell, Inc. (NOV)

Year Pb Ratio
2002
2003 3.34
2004 4.67
2005 5.36
2006 4.7
2007 4.1
2008 0.83
2009 1.3
2010 1.71
2011 1.66
2012 1.43