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US Patent: 34,333
Hot Air Engine
Patentee: S. H. Roper (exact or similar names) - Boston, Middlesex County, MA USPTO Classifications: 60/794 Tool Categories: propulsion and energy : external combustion engines : hot air engines Assignees: Elmer Townsend - Boston, Middlesex County, MA Manufacturer: Abel W. Tripp - Boston, Suffolk County, MA Witnesses: Unknown	Patent Dates: Granted: Feb. 04, 1862 Patent Pictures: [ 1 | 2 | 3 | 4 ] USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Sherrill Roper Air Engine Co.

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