Foreword - 8 SK600 Operator’s Manual p SK600 Operator’s Manual Issue number 3.0/OM-08/19 Part number 053-2962 by The Charles Machine Works, Inc. Copyright 2016, 2017, 2019 and Ditch Witch are registered trademarks of The Charles Machine Works, Inc. This product and its use may be covered by one or more patents at http://patents.charlesmachine.works.