The machine for cutting and expanding the wheel lock ring
scouring wheel and buffing wheel
sprocket ; sprocket-wheel ; sprocket gear ; chain wheel
sprocket sprocket-wheel sprocket gear chain wheel
wheel turning lathe not needing to take wheel off the bogie
base-ring and frame-ring
collector ring (slip-ring)
column-ring beam joint with shear ring bars
outside ring in-feed system ring
ring of n×n matrices over ring R
ring out the old year and ring in the new
Riser-ring and Ring Module
short-proof ring (arcing ring)