US Patent: 438,210
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| Printer's Quoin
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Patentee:
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| William Wickersham (exact or similar names) - Worcester, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Mar. 29, 1888 |
| Granted: |
Oct. 14, 1890 |
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Patent Pictures:
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William Wickersham patent Oct. 14, 1890 |
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Stan Schulz
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Description: |
| The quoin is expanded by an internal cam, either of one continuous lobe, or of paired lobes.
The patent is included because of the square-ended quoin key. |
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