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| All Patents in class 24/68CT | |||||
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| Number | Date | Patentee | Title | Type | |
| 621,293 | Mar. 14, 1899 | G.F. Crass | Chain Pipe Wrench | chain and strap wrenches | |
| 2,100,564 | Nov. 30, 1937 | E.M. Pfauser, S. Mandl | Method of Producung a Pulling Strees and Hydraulic Pulling Mechanism | ||