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| All Patents in class 335/306 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,209,558 | Jul. 30, 1940 | O. Block, J. Bing | Magnetic clamping appliance | surface gauges | |
| 2,609,430 | Sep. 02, 1952 | W.L. Bower | Magnetic Work Holder | chucks | |