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| All Patents in class 228/4.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 549,711 | Nov. 12, 1895 | A. Farrensteiner | Pipe Welding Machine | welding machines | |
| 3,534,897 | Oct. 20, 1970 | C.R. Gross | Electronic control circuit for automatically fed machines | can making machines | |