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| All Patents in class 279/139 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,812,455 | Jun. 30, 1931 | B.F. Stowell | Diaphragm chuck | grinders | |
| 1,858,693 | May 17, 1932 | C.E. Van Norman | Chuck | chucks | |
| 2,535,199 | Dec. 26, 1950 | B.C. Day | Gear holding diaphragm chuck | grinders | |
| 2,538,289 | Jan. 16, 1951 | M.H. Arms | Diaphragm chuck | grinders | |
| 2,912,892 | Nov. 17, 1959 | J.H. Hoern | Continuous Boring and Turning Machines | vertical boring mills | |