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| All Patents in class 476/68 | |||||
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| Number | Date | Patentee | Title | Type | |
| 405,759 | Jun. 25, 1889 | A.M. Benson | Gearing | woodworking machine mechanisms | |
| 3,122,932 | Mar. 03, 1964 | J.F. Kopczynski | Machine tool | grinding attachments | |