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| All Patents of Type: draftsmans rule | |||||
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| Number | Date | Patentee | Title | Type | |
| 336,700 | Feb. 23, 1886 | F.A. Combes | Ruler | draftsmans rule | |
| 360,545 | Apr. 05, 1887 | E.F. Wagner | Draftsman's Rule | draftsmans rule | |