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US Patent: 122,848
Improvements in Traction Engine
Patentee: Robert Crouch Parvin (exact or similar names) - Philadelphia, PA USPTO Classifications: 305/189, 305/195, 305/42 Tool Categories: propulsion and energy : steam apparatus : steam traction engines : traction engine tracks Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Granted: Jan. 16, 1872 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Northwestern Parvin Steam Motor Mfg. Co.

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