References
^ Oberg, Jones, Ryffel, McCauley and Heald Heald (2012). 9780831128289, Industrial Press. ISBN 9780831128289 (revised Dec 2014)^ Franklin Jones, Erik ObergMachinery's Handbook by Erik Oberg and Franklin Jones (2008, Mixed Media / Merchandise, Other) ISBN 9780831128289 (revised Mar 2015)
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