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| All Patents of Type: thread measuring machines | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,470,836 | Oct. 16, 1923 | R. Hill | Lead Measuring Machine for Gauges | thread measuring machines | |
| 2,491,403 | Dec. 13, 1949 | K.H. Wills | Indicator and Control Means for Lead Screw Correction | thread measuring machines | |
| 2,492,251 | Dec. 27, 1949 | K.H. Wills | Lead Screw Variator | thread measuring machines | |