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| All Patents in class 148/528 | |||||
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| Number | Date | Patentee | Title | Type | |
| 18,327 | Oct. 06, 1857 | S. Darling | Manufacture of Metallic Squares | try squares | |
| RE2,869 | Feb. 18, 1868 | S. Darling | Improvement in the Manufacture of Metallic Squares | try squares | |