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| All Patents in class 279/2.12 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,464,156 | Mar. 08, 1949 | C. Campbell, K.K. Nielsen, G.L. Sandersen | Expanding Chuck or Mandrel | metalworking machine vises | |
| 2,759,733 | Aug. 21, 1956 | H.E. Sloan | Expansible Collet | metal lathe chucks | |