"No oil metal" solid piston ring for 26 1/2" diam. cylinder. Loftus Perkins's patent A.D. 1872
"No oil metal" solid piston ring for 26 1/2" diam. cylinder. Loftus Perkins's patent A.D. 1872, No.3845
"No oil metal" solid piston ring for 26 1/2" diam. cylinder. Loftus Perkins's patent A.D. 1872, No.3845