Wellworthy Simplex patent split piston ring, 1936
Wellworthy Simplex patent split piston ring, 4.5625" diameter
Wellworthy Simplex patent piston ring, 4.5625" diameter
Wellworthy Simplex patent split piston ring, 4.5625" diameter
Wellworthy Simplex patent split piston ring, Wellworthy Piston Rings Ltd. 1936