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| All Patents in class 33/449 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 35,812 | Jul. 08, 1862 | J.C. Dow, I. Myrick | Improvement in Parallel Rulers | |
 | 50,980 | Nov. 14, 1865 | W.L. Woods | Rolling Rule | |
| 933,798 | Sep. 14, 1909 | H. Van Altena | Parallel Ruler | ||