| 1 | 25-year-old Electromagnetic Chuck: Replace the wires and outlet box | 2020/12/29 |
| 2 | 20-year-old Permanent Electromagnetic Chuck: Replace the wires and outlet box | 2020/12/29 |
| 3 | Other Battery Type Magnetic Lifter: Replace the operation panel and repaint | 2020/12/29 |
| 4 | Other Battery Type Magnetic Lifter: Replace the copper coil and strength the magnetic force | 2020/12/29 |
| 5 | Other Brands Five-Pole Section Round Electromagnetic Chuck: Replace the wires | 2020/12/30 |
| 6 | Other Brands Permanent Electromagnetic Chuck | 2023/01/12 |
| 7 | Maintenance notes |
