| 摘要 |
A metal detector for control of protected access comprising two oblong shape vertical housings (10, 12), and emitting and receiving electrical coils (3, 5) provided in said housings, characterized in that at least an additional type of sensors (4) is provided in at least one of said housings (10, 12), said coils (3, 5) and additional type of sensors (4) being symmetrically provided in said at least one of said housings so as to present a physical and geometrical coincidence detections.
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