US Patent: 660,876
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| Try Square
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Patentee:
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| Derrick S. West (exact or similar names) - Boston, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Apr. 19, 1899 |
| Granted: |
Oct. 30, 1900 |
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Russ Allen.
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Description: |
| Single piece, metal construction to ensure square remains true. |
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