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| All Patents in class 16/342 | |||||
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| Number | Date | Patentee | Title | Type | |
| 588,294 | Aug. 17, 1897 | C.E. Riecker | Rule-Joint | folding rule joints | |
| 1,512,728 | Oct. 21, 1924 | C.G. Watson | Spring Joint for Extension Rules | folding rule joints | |