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US Patent: 138,256
Improvement in Files
Patentee:
James B. Johnson - 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 pdf tiff
Google Patents
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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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