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US Patent: 142,445
Improvement in files
Patentee: Henry Disston (exact or similar names) - Philadelphia, PA USPTO Classifications: 76/24.1, 76/31 Tool Categories: industrial tools : files metalworking tools : files Assignees: None Manufacturer: Henry Disston & Sons - Philadelphia, PA Witnesses: Samuel Bevan A. H. Shoemaker	Patent Dates: Applied: Apr. 18, 1873 Granted: Sep. 02, 1873 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Henry Disston & Sons

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