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| All Patents in class 228/60 | |||||
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| Number | Date | Patentee | Title | Type | |
| 331,527 | Dec. 01, 1885 | C.W. Nason | Machine for Welding Plugs in the Ends of Tubes | welding apparatus | |
| 1,280,823 | Oct. 08, 1918 | H.W. Oster | Mechanism for closing and finishing the ends of metal tubes | metalworking machines | |