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| Patents Granted on 1957-07-23 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,799,942 | Jul. 23, 1957 | H.W. Ehler | Unitary rule slide | vernier calipers | |
| 2,800,032 | Jul. 23, 1957 | B.R. Granberg | Drive mechanism | ||
| 2,800,046 | Jul. 23, 1957 | T.J. Kluck | Tool Holder and Mounting Means Therefor | lathe tool holders and tool posts | |