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US Patent: 642,828
Grinding or Polishing Wheel
Patentee:
Joseph F. Spohn (exact or similar names) - Scranton, Lackawana County, PA

USPTO Classifications:
451/342, 451/546

Tool Categories:
metalworking machines : grinders : grinder wheels

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: Jul. 17, 1899
Granted: Feb. 06, 1900

Patent Pictures:
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