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Lock-Step Piston Ring, 12" diam.

Lock-Step Piston Ring, 12" diam.

piston ring for the low pressure piston

piston ring for the low pressure piston

Two "no oil metal" split piston rings for 8" diam.

Two "no oil metal" split piston rings for 8" diam.

Set of patent "super limit" piston rings

Set of patent "super limit" piston rings

"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

Set of patent twin piston rings, 7 1/2" diam.

Set of patent twin piston rings

"Campbell and Banks" Piston Ring with springs and packing (sectioned)

"Campbell and Banks" Piston Ring