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| All Patents in class 30/300 | |||||
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| Number | Date | Patentee | Title | Type | |
| 286,610 | Oct. 16, 1883 | I.W. Heysinger | Bit-brace and washer cutter | braces | |
| 352,139 | Nov. 09, 1886 | J. Leuenberger | Washer or gasket cutter | washer cutters | |