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US Patent: 385,347
Metal Hardening Device
Patentee: John G. Folsom (exact or similar names) - Winchendon, Worcester County, MA USPTO Classifications: 266/274 Tool Categories: specialty machines : heat treating machines Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Dec. 23, 0187 Granted: Jul. 03, 1888 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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