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| All Patents in class 451/429 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,047,591 | Jul. 14, 1936 | A.W. Mall | Rail surface grinder | ||
| 2,081,360 | May 25, 1937 | A.W. Mall | Rail slotter | ||
| 2,214,141 | Sep. 10, 1940 | A.W. Mall | Rail slotter | ||