Foreword - 8 RT45 Operator’s Manual p RT45 Operator’s Manual This manual covers the following model: RT45 Tier 4. Issue number 3.0/OM-06/16 Part number 053-2746 Copyright 2014, 2016 by The Charles Machine Works, Inc. 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.