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| All Patents in class 221/158 | |||||
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| Number | Date | Patentee | Title | Type | |
| 295,705 | Mar. 25, 1884 | G.R. Williams | Button Machine | button making machinery | |
| 2,889,023 | Jun. 02, 1959 | A.D. Moncrieff | Apparatus for Orienting Workpieces | workpiece changers and storage mechanisms | |