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| All Patents in class 476/73 | |||||
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| Number | Date | Patentee | Title | Type | |
| 761,384 | May 31, 1904 | J.W. Lambert | Friction Gearing | automobiles | |
| 3,122,932 | Mar. 03, 1964 | J.F. Kopczynski | Machine tool | grinding attachments | |