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J.Marrs, P.E.. (2012). Machine Designers Reference . New york: industrial press,inc.

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J.Marrs, P.E.. Machine Designers Reference. New york: industrial press,inc, 2012. Text.

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J.Marrs, P.E.. Machine Designers Reference. New york: industrial press,inc, 2012. Text.

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J.Marrs, P.E.. Machine Designers Reference. New york: industrial press,inc, 2012. Print.