US Patent: 532,658
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| Folding Ruler
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Patentee:
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| George Curtis Gillespie (exact or similar names) - Bath Beach, NY |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Nov. 28, 1893 |
| Granted: |
Jan. 15, 1895 |
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Russ Allen.
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Description: |
| All joints are made flush instead of having projecting knuckles on any sides while still folding the same way as conventional wooden folding rules. |
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