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| All Patents in class 403/DIG.8 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,502,528 | Jul. 22, 1924 | L. Reulbach | Extensible Tool Holder | drilling and boring tool holders | |
| 1,568,296 | Jan. 05, 1926 | J.A. Schleicher | Spindle clamping device | ||