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| Patents for Challenge Cutlery Corp. | |||||
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| Number | Date | Patentee | Title | Type | |
| 768,324 | Aug. 23, 1904 | R.A. Breul | Miter-Square | miter squares | |
| 806,518 | Dec. 05, 1905 | F.G. Breul | Sheet Metal Square/ Bevel | squares | |