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| Patents Granted on 1939-08-08 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,168,307 | Aug. 08, 1939 | P.S. Russel, A.G. Hann | Control Device | flow controls | |
| 2,168,545 | Aug. 08, 1939 | D.D. Wile | Control Device | industrial control apparatus | |
| 2,168,564 | Aug. 08, 1939 | D.D. Wile, E.J. Dillman | Control Device | thermostats | |
| 2,169,159 | Aug. 08, 1939 | G. Müller | Means for Accurate Screw Cutting | metalworking machines | |