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| Patents for Douglas Aircraft Co. Inc. | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,427,924 | Sep. 23, 1947 | E.H. Rose | Internal Screw Thread and Diameter Gauge | measurement gauges | |
| 2,548,490 | Apr. 10, 1951 | O.A. Muller | Depth and Angle Gauge | micrometer depth gauges | |