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| Patents for General Motors Research Corp. | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,490,223 | Apr. 15, 1924 | T. Midgley, Jr. | Indicator | pressure indicators | |
| 1,492,754 | May 06, 1924 | J.H. Sheats | Engine Indicator | internal combustion engine indicators | |