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| All Patents in class 81/478 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 414,615 | Nov. 05, 1889 | J. Walker | Tension Registering Wrench | |
 | 2,205,501 | Jun. 25, 1940 | J. Sunnen | Safety Wrench | |
| 2,385,591 | Sep. 25, 1945 | P.A. Sturtevant | Force Transmitting Measuring Mechanism | ||
| 3,355,970 | Dec. 05, 1967 | G.E. Olson, R.G. Knudsen | Pre-Set Adjustable Torque Wrenches | ||
 | 3,616,714 | Nov. 02, 1971 | G.W. Gregory | Rack and Pinion Squeeze Action Wrench | |