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| All Patents in class 407/23 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,142,285 | Jan. 03, 1939 | H. Pelphrey | Hob and Method of Manufacture | gear cutting tools | |
| 2,326,932 | Aug. 17, 1943 | J.C. Drader | Hob | gear cutting tools | |