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| Patents for George F. Crass | |||||
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| Number | Date | Patentee | Title | Type | |
| 555,931 | Mar. 10, 1896 | G.F. Crass | Chain Pipe Wrench | chain and strap wrenches | |
| 621,293 | Mar. 14, 1899 | G.F. Crass | Chain Pipe Wrench | chain and strap wrenches | |