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| All Patents in class 12/33 | |||||
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| Number | Date | Patentee | Title | Type | |
| 17,914 | Aug. 04, 1857 | R. Brayton | Nut Machine | nut or bolt making machines | |
| 1,463,095 | Jul. 24, 1923 | A. Rudnay | Micrometer Attachment | micrometer attachments | |