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| All Patents in class 403/381 | |||||
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| Number | Date | Patentee | Title | Type | |
| 520,000 | May 15, 1894 | M. Hardsocq | Mining Tool | hammers | |
| 1,285,628 | Nov. 26, 1918 | C.C. Craley | Metal Working Machine | drill press accessories | |
| 2,320,776 | Jun. 01, 1943 | G. Gorton | Machine Tool | milling machines | |
| 2,512,177 | Jun. 20, 1950 | S. Shaler | Steel square | carpenter squares | |
| 4,300,271 | Nov. 17, 1981 | G. Wohlhaupter | Clamping device for a sliding mount | boring heads | |