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| All Patents in class 221/212 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,548,563 | Aug. 04, 1925 | H.K. Spencer | Means For Handling Articles | grinding attachments | |
| 3,127,716 | Apr. 07, 1964 | J.F. Uckotter, R.D. Peters | Machine Tool Loader | workpiece changers and storage mechanisms | |
| 3,208,578 | Sep. 28, 1965 | E.I. Odell | Method and Apparatus for Orientating Articles | metalworking machine mechanisms | |