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| All Patents in class 409/14 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,769,375 | Nov. 06, 1956 | A.D. Moncrieff | Hobbing Machine | gear making machines | |
| 2,839,968 | Jun. 24, 1958 | A.D. Moncrieff | Hobbing Machine | gear making machines | |