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US Patent: 167,527
Improvement in molds for forming artificial grindstones
Patentee:
Gilbert Hart - Detroit, MI

USPTO Classifications:
249/112, 249/146, 249/166

Tool Categories:
industrial tools : grinding wheels
metalworking machines : grinders : sharpening machines : grinding wheels

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
George Scott
G. L. Howard

Patent Dates:
Applied: Mar. 13, 1875
Granted: Sep. 07, 1875

Patent Pictures:
USPTO pdf tiff
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