US Patent: 172,337
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| Improvement in emery grinding-wheels
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Patentee:
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| Samuel G. Morrison (exact or similar names) - Williamsport, PA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
May 27, 1875 |
| Granted: |
Jan. 18, 1876 |
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Jeff Joslin
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Description: |
| Improvement to the inventor's patent 163,025. A circular metal plate with "dovetails" cut around the periphery has emery moulded around its periphery to a thickness greater than that of the metal plate. |
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