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| Patent NS21 | |||||
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| Number | Date | Patentee | Title | Type | |
| NS-21 | Oct. 13, 1854 | J.W. Archibald | A ship's windlass | boats and ships | |
| NF-21 | Mar. 09, 1860 | R. Neyle | Improvement in cod-jiggers | ||
| CS-21 | Sep. 14, 1861 | J.P. Rankin | Breech Loading Gun | ||