滚子链联轴器

rice leaf roller, rice leaf folder, {Cnaphalocrocis medinalis} Guenè)

roller and compactor【公路】

roll-type grille, roller blind

guide, roller, cable

roller mill【机】;roller press【机】;wheeling machine【皮革】

single-slat roller shutter

lick roller for the application of liquids on to textile materials

superfinishing machine for conical roller