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| All Patents in class 33/450 | |||||
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| Number | Date | Patentee | Title | Type | |
| 393,290 | Nov. 20, 1888 | A.C. Both | Scale divider and section liner | layout tools | |
| 471,428 | Mar. 22, 1892 | L. Miller | Combined Section Liner and Protractor | protractors | |
| 1,529,209 | Mar. 10, 1925 | J.W. Parker | Protractor | rules | |