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| All Patents in class 225/91 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 44,874 | Nov. 01, 1864 | R.F. McCoy, H.L. Herwig | Metal Ruler | |
 | 159,294 | Feb. 02, 1875 | T.H. Belcher, H. Belcher | Improvement in Rulers | |