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| All Patents in class 409/51 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,001,008 | Aug. 22, 1911 | N.H. Fay | Feeding Blanks to Rack Cutting Machines | gear making machines | |
| 4,463,488 | Aug. 07, 1984 | D.J. Pieczulewski | Indexing work table | indexers and dividers | |
| 4,534,684 | Aug. 13, 1985 | B.H. Johnson | Apparatus For Milling A Gear For A Double Enveloping Worm Gear Drive | ||