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| All Patents in class 409/19 | |||||
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| Number | Date | Patentee | Title | Type | |
| 955,498 | Apr. 19, 1910 | J.M. Campbell | Gear Cutting Attachment for Lathes | metal lathe accessories and attachments | |
| 978,113 | Dec. 06, 1910 | P. Catucci | Hobbing gear-cutter | gear hob cutters | |
| 2,839,968 | Jun. 24, 1958 | A.D. Moncrieff | Hobbing Machine | gear making machines | |