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US Patent: 138,256
Improvement in Files
Patentee: James B. Johnson (exact or similar names) - San Francisco, CA USPTO Classifications: 76/24.1, 76/31 Tool Categories: metalworking tools : files woodworking tools : handsaws : saw sharpening tools Assignees: None Manufacturer: Not known to have been produced Witnesses: Jno. L. Boone C. M. Richardson	Patent Dates: Applied: Oct. 04, 1872 Granted: Apr. 29, 1873 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.
Description: Saw filing files with rounded edges instead of sharp edges to prevent creating a stress riser at the base of the tooth.

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