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| All Patents in class 193/31R | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,042,257 | May 26, 1936 | C.W. Hopkins, R.E. Harrison | Machine Tool | grinding machines | |
| 2,889,023 | Jun. 02, 1959 | A.D. Moncrieff | Apparatus for Orienting Workpieces | workpiece changers and storage mechanisms | |