Foreword - 8 RT40 Operator’s Manual p RT40 Operator’s Manual Issue number 1.3/OM-7/06 Part number 054-130 Copyright 2004, 2005, 2006 by The Charles Machine Works, Inc. , Ditch Witch, CMW, AutoCrowd, Modularmatic, Jet Trac, Roto Witch, Subsite, Fluid Miser, Perma-Soil, Power Pipe, Super Witch, Super Witch II, Pierce Airrow, The Underground, and The Underground Authority Worldwide are registered trademarks of The Charles Machine Works, Inc. CMW