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Foreword - 6<strong>OnGrade</strong> Operator’s <strong>Manual</strong><strong>OnGrade</strong>Operator’s <strong>Manual</strong>Issue number 1.0/OM-2/10Part number 053-1393Copyright 2010by The Charles Machine Works, Inc., <strong>Ditch</strong> <strong>Witch</strong>, CMW, AutoCrowd, Jet Trac, Roto <strong>Witch</strong>, Subsite, Fluid Miser,Power Pipe, Super <strong>Witch</strong>, Pierce Airrow, The Underground, The Underground Authority Worldwide, andZahn are registered trademarks of The Charles Machine Works, Inc.This product is covered by the following patents:U.S. 7510029; DE (Germany) 602006008328.9-08; UK 1929125; other patents pending.CMW