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| All Patents in class 33/422 | |||||
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| Number | Date | Patentee | Title | Type | |
| 29,133 | Jul. 17, 1860 | S. Barnett | Plotting Instrument | ||
| 165,519 | Jul. 13, 1875 | A. Swasey | Protractor | protractors | |
| 367,673 | Aug. 02, 1887 | A.J. Shaw | Draftsman's protractor | protractors | |