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| All Patents in class 82/52 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,248,276 | Nov. 27, 1917 | F.J. Curtis | Machine-tool | horizontal boring mills | |
| 2,791,921 | May 14, 1957 | F.F. Rohrer, H.J. Ross, C.W. Heppenstall | Lathe System or the Like | metal lathes | |