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| All Patents in class 81/376 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,377,612 | Jun. 05, 1945 | G.H. Clark | Wrench | pipe wrenches | |
| 2,495,699 | Jan. 31, 1950 | G.H. Clark | Grip Tightening Device for Pipe Wrenches | pipe wrenches | |
| 2,696,747 | Dec. 14, 1954 | M.D. Bergan | Toggle-Actuated Crimping Tool with Full-Stroke Compelling Mechanism | electrician | |
| 2,769,359 | Nov. 06, 1956 | J.W. Healy | Toggle Wrench | quick adjust wrenches | |