Foreword - 8 HT220 Operator’s Manual HT220 Tier 3 Operator’s Manual Issue number 1.0/OM-10/08 Part number 053-1292 by The Charles Machine Works, Inc. Copyright 2008 , Ditch Witch, CMW, AutoCrowd, Jet Trac, Roto Witch, Subsite, Fluid Miser, Power Pipe, Super Witch, Pierce Airrow, The Underground, The Underground Authority Worldwide, and Zahn are registered trademarks of The Charles Machine Works, Inc. CMW