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| Patents Granted on 1939-08-29 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,171,208 | Aug. 29, 1939 | F.S. Haas, A.H. Dall | High Speed Spindle Construction | grinding machines | |
| 2,171,271 | Aug. 29, 1939 | A.M. Johnson | Honing machine | honing machines | |
| 2,171,417 | Aug. 29, 1939 | E.M. McGovern, P. Schrick | Crankshaft grinding tool | automotive tools | |