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| All Patents in class 116/212 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,269,503 | Jan. 13, 1942 | H.W. Zimmerman | Torque measuring wrench | torque wrenches | |
| 2,461,491 | Feb. 08, 1949 | R.E. Booth | Torque tool | screwdrivers | |