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| All Patents in class 425/DIG.218 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,100,984 | Jun. 23, 1914 | W. Murchey | Screw-cutting tap | tapping heads and chucks | |
| 1,361,400 | Dec. 07, 1920 | R.B. Tewksbury, H.W. Oster | Diestock | taps and dies | |