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| All Patents in class 242/375.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,782,669 | Nov. 25, 1930 | A. Turner | Grinding Machinery | grinding machines | |
| 1,926,452 | Sep. 12, 1933 | R.A. Norling | Balancer | ||