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| All Patents of Type: metal washer making machines | |||||
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| Number | Date | Patentee | Title | Type | |
| 12,194 | Jan. 09, 1855 | R. Brayton | Machine for Making Nuts and Washers | nut or bolt making machines | |
| 16,372 | Jan. 13, 1857 | R. Brayton | Making Nuts and Washers | nut or bolt making machines | |
| 169,260 | Oct. 26, 1875 | J.W. Grover | Machines for Making Spring Washers | metal washer making machines | |