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| All Patents in class 403/333 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,076,971 | Oct. 28, 1913 | C. Geiger | Tool Holder | surgeon | |
| 2,330,686 | Sep. 28, 1943 | C.N. Williams, E.S. Cornell | Tool Spindle with Removable Projection | metalworking power transmission | |