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| All Patents in class 33/479 | |||||
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| Number | Date | Patentee | Title | Type | |
| 354,865 | Dec. 21, 1886 | W.H. Jones | Pocket Rule | folding rules | |
| 1,000,221 | Aug. 08, 1911 | H. Wilms | Drafting Instrument | squares | |