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| Number | Title | Issue Date |
| 6557429 | Method of using magnetic lifting devices A method of testing whether a magnetic lifting device may safely lift a particular load where the magnetic lifting device is placed adjacent to the load, some or all of the magnetic elements of the magnetic lifting device are spaced such that the lifting ... | 05/06/2003 |
| 5275514 | Drill support A portable workpiece-mounted machine tool such as a drill is provided with a permanent-electromagnet attaching unit which has its reversible permanent magnets alternating with nonreversible permanent magnets so that, when electric current is applied to th... | 01/04/1994 |
