| 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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