lumbar traction bed 1.controled by computer 2.four function 3.safty and durable 4.nice ... three dimensional traction,YXZ-X lumbar vertebra traction bed model computer controlled four dimensional stereoscopic lumbar vertebra traction bed has ... systems:single-chip microcomputer touch operationg system,use it singly;computer controlled,Chinese display,set parameter randomly,multiple protection;Slow ...