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| All Patents in class 212/331 | |||||
| Number | Date | Patentee | Title | Type | |
| 626,276 | Jun. 06, 1899 | A.R. Goldie | Traveling crane or conveyer | ||
| 2,623,429 | Dec. 30, 1952 | H.J. Siekmann, W.R. Meyer | Work Handling Appparatus for Machine Tools | metalworking machine mechanisms | |