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| All Patents in class 451/115 | |||||
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| Number | Date | Patentee | Title | Type | |
| 525,441 | Sep. 04, 1894 | W. Brunner | Valve Reseating Machine | valve reseating machines | |
| 1,282,018 | Oct. 22, 1918 | F.O. Albertson | Valve Grinder | valve grinding tools | |