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| All Patents in class 221/157 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,835,591 | Dec. 08, 1931 | E.P. Bullard | Automatic Work Feeding and Chucking Means for Multiple Spindle Lathes | ||
| 2,761,585 | Sep. 04, 1956 | R.H. Mustonen, I.J. Gruenberg, A.A. Muehling | Apparatus for orienting prismatic bodies | ||