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| All Patents in class 33/35 | |||||
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| Number | Date | Patentee | Title | Type | |
| 372,319 | Nov. 01, 1887 | J.S. Mather | Pen and Ruler for Bookkeeping | rules | |
| 630,262 | Aug. 01, 1899 | A. Nacke | Plumb Bob | plumb bobs | |