... Drum Mortar Mixer 1it is widely used in construction ,road,bridge ,and others 2,durable 3Double drum HJB Double Drum Mortar ... Mixer 1it is widely used in construction ,road,bridge ,and other work place .2,durable 3Double drum1it is widely ... used in construction ,road,bridge ,and other work place .2,durable 3Double drumApplication :HJB Double ...