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US Patent: 2,131,970
Piston Ring Construction
Patentee: Frederick Ritz (exact or similar names) - Hamilton, Butler County, OH USPTO Classifications: 277/461 Tool Categories: propulsion and energy : internal combustion engines : piston rings Assignees: Fairbanks, Morse & Co. - Chicago, Cook County, IL Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Mar. 09, 1936 Granted: Oct. 04, 1938 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Fairbanks Morse & Co.

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