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| Patents Granted on 1931-09-22 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,824,623 | Sep. 22, 1931 | P.L. Robertson | Tool Holder | tool holders | |
| 1,824,700 | Sep. 22, 1931 | L.R. Williamson | Hydraulically operated reversing mechanism | tapping machines | |
| 1,824,743 | Sep. 22, 1931 | K.B. Neu | Piston Pin Tool | automotive tools | |