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| Patents Granted on 1939-03-07 | |||||
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| Number | Date | Patentee | Title | Type | |
| GB-501,911 | Mar. 07, 1939 | H.H. Asbridge | Improvements in variable speed drives in precision grinding machines | ||
| 2,149,409 | Mar. 07, 1939 | F.D. Van Norman, B.F. Stowell, R.S. Pyne | Oscillating grinder | grinders | |
| 2,149,940 | Mar. 07, 1939 | O. Kylin | Brake and Control Therefor | metalworking machine mechanisms | |