Two "no oil metal" split piston rings for 8" diam.
One "no oil metal" split piston ring for 8" diam. cylinder. Loftus Perkins's patent A.D. 1872 No.3845
One "no oil metal" split piston ring for 8" diam. cylinder. Loftus Perkins's patent A.D. 1872 No.3845