FIELD: examination of passengers before their enplaning, control of persons entering and leaving factory. SUBSTANCE: device has delay element 24, amplifier 5, synchronic detector 7, radiating coil 2, reception coil 3, AND gate 19, actuating unit 20 and alternating voltage generator, amplifier 6, synchronic amplifier 6, synchronic detector 8, cut-off input elements 9, 10, integrators 11, 12, diversity unit 13, sequence unit 21, key 14, rectifiers 15, 16, memory elements 17, 18, and reception coil 4. EFFECT: enhanced examination reliability. 1 dwg
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Authors
Dates
1994-09-30—Published
1992-06-18—Filed