Jammer 1 : A truck-mounted two-drum hauler incorporating a leaning boom on which blocks are hung, for short-distance hauling and, sometimes, for loading
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}