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| All Patents in class 81/70 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,933,512 | Oct. 31, 1933 | W.R. Moore | Pipe Wrench | chain and strap wrenches | |
| 1,933,513 | Oct. 31, 1933 | W.S. Stuart | Chain Pipe Wrench | chain and strap wrenches | |
| 1,933,514 | Oct. 31, 1933 | W.S. Stuart | Chain Pipe Wrench | chain and strap wrenches | |
| 2,944,452 | Jul. 12, 1960 | R.W. Vose | Chain Link Pipe Wrench with Plural Handle-Jaw Surfaces | chain and strap wrenches | |