| 摘要 |
The invention relates to a system for detecting the presence of strong magnets. For that purpose, the system is provided with detector units (1), in which building blocks (4a,4b,4c,4d) are placed with detectors sensitive to a magnetic field and with indicators, which may indicate the presence of a strong magnetic field. If desired, also the height of the magnet and the orientation of the magnetic field can be indicated. <IMAGE>
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