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| Patents Granted on 1923-04-24 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,452,940 | Apr. 24, 1923 | C. Stecher | Boring machine | drilling and boring | |
| 1,453,008 | Apr. 24, 1923 | W.R. Fox, H.D. Corwin | Multiple-drilling machine | ||