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US Patent: 774,134
Tool Holder for Grindstones
Patentee:
Silas L. Derby (exact or similar names) - Frewsburg, Chautauqua County, NY

USPTO Classifications:
451/213

Tool Categories:
industrial tools : tool holders
metalworking machines : grinders

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: May 31, 1904
Granted: Nov. 01, 1904

Patent Pictures:
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