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| All Patents in class 279/130 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,538,289 | Jan. 16, 1951 | M.H. Arms | Diaphragm chuck | grinders | |
| 2,729,459 | Jan. 03, 1956 | L.A. Leifer | Balanced Rotary Chuck | metal lathe chucks | |