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| All Patents in class 221/186 | |||||
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| Number | Date | Patentee | Title | Type | |
| 333,461 | Dec. 29, 1885 | E.L. Bowers, W.L. Grout | Machine for Drilling Metal Blanks | horizontal drilling machines | |
| 2,078,659 | Apr. 27, 1937 | J. Gualtiere | Rivet feed | riveting machines | |