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| All Patents in class 235/69 | |||||
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| Number | Date | Patentee | Title | Type | |
| 67,269 | Jul. 30, 1867 | F.J. Coffin | Improvement in Slides for Rules, Scales and Tables | rule attachments | |
| 557,246 | Mar. 31, 1896 | G.F. Wynne | Photographic Exposure Meter | special purpose slide rules | |
| 756,055 | Mar. 29, 1904 | L.B. Rhodes | Protractor Rule | folding rules | |