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| Patents for Charles G. Watson | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,512,728 | Oct. 21, 1924 | C.G. Watson | Spring Joint for Extension Rules | folding rule joints | |
| 1,718,505 | Jun. 25, 1929 | C.G. Watson | Spring Joint for Folding Rule | folding rule joints | |