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| All Patents in class 384/542 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,731,670 | Oct. 15, 1929 | D.C. Klausmeyer | Simplified Mount for Concentrically Suspending Sleeves | metalworking machine mechanisms | |
| 1,834,627 | Dec. 01, 1931 | B. Lundgreen | Spindle Mounting | grinding machines | |
| 1,904,395 | Apr. 18, 1933 | A.G. Whitehead | Spindle Bearing | metalworking machine bearings | |