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| Patents Granted on 1939-04-11 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,153,847 | Apr. 11, 1939 | L. Scruggs | Chuck or Tool Holder | metalworking machine tool holders | |
| 2,154,249 | Apr. 11, 1939 | F.P. Porter | Internal Combustion Engine | internal combustion engines | |
| 2,154,367 | Apr. 11, 1939 | J.M. Up De Graff | Combination Hack and Compass Saw Frame | ||