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| All Patents in class 451/907 | |||||
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| Number | Date | Patentee | Title | Type | |
| 803,657 | Nov. 07, 1905 | O. Zschockelt | Collector-Polisher | commutator dressing machines | |
| 7,585,206 | Sep. 08, 2009 | J.R. Memmelaar, Jr. | Spool to Spool Continuous Through Feed System | centerless grinders | |