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| Patents Granted on 1971-03-09 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,568,283 | Mar. 09, 1971 | E. Wyss | Metal Cutting Tool | insert tool holders | |
| 3,568,566 | Mar. 09, 1971 | M. Weidig | Tool Spindle Mechanism | metalworking machine tool holders | |
| 3,568,739 | Mar. 09, 1971 | C.E. Kirk | Rafter gauge | gauges | |