section v-v v-v

section x-x x-x

double V groove

double V groove weld

double-V groove

bar double-X

double double iron

double groove

Double Groove Ball Bearing

double groove continuous extruding machine

double groove weld

double v butt joint

double V engine

double v groovex

double V-belt

Double V-shaped incision

double V-trough drainage

double X-ray exposures

double X-shape arch bridge