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US Patent: 76,581
Improvement in decarbonizing iron
Patentee: John F. Allen (exact or similar names) - Tremont, NY USPTO Classifications: 266/202, 432/118, 75/525 Tool Categories: trade specific : foundryman Assignees: None Manufacturer: Porter-Allen Engine Co. - New York, NY Witnesses: Henry E. Roeder William Derfer	Patent Dates: Granted: Apr. 14, 1868 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Porter-Allen Engine Co.

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