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| All Patents in class 403/109.3 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,030,592 | Jun. 25, 1912 | J.A. Leland | Telescopic Extension-Rod | drill bit extensions | |
| 1,958,024 | May 08, 1934 | A.L. Stowell | Friction Spring | rules | |
| 1,958,941 | May 15, 1934 | K.J. Chapman | Tool Holder for Nibbling Machines | tool holders | |