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| All Patents in class 33/30.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 15,183 | Jun. 24, 1856 | C.R. Iliff | Drafting Protractors | protractors | |
| 73,290 | Jan. 14, 1868 | F. Bowly | Improvement in instruments for drawing ellipses | special purpose gauges | |