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US Patent: 2,343,421
Torsional Vibration Damper
Patentee: Frederic P. Porter (exact or similar names) - Beloit, Rock County, WI USPTO Classifications: 74/574.3 Tool Categories: industrial machines : vibration dampers Assignees: Fairbanks, Morse & Co. - Chicago, Cook County, IL Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jul. 31, 1942 Granted: Mar. 07, 1944 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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