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| All Patents in class 384/219 | |||||
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| Number | Date | Patentee | Title | Type | |
| 462,436 | Nov. 03, 1891 | W. Hollingsworth, F.X. Hooper | Bearing and supporting device | ||
| 1,482,856 | Feb. 05, 1924 | R.L. Morgan | Bearing for grinding spindles | grinders | |
| 1,778,452 | Oct. 14, 1930 | H. Ernst | Grinding Machinery | grinding machines | |