Anti-theft tags
contain a tiny
mechanical
oscillator that is
activated by a
magnetic field.
The detectors at a
shop's
doorway can detect
the osc
(more)
Anti-theft tags contain a tiny mechanical oscillator that is activated by a magnetic field. The detectors at a shop's doorway can detect the oscillation magnetically. The tag can be activated and deactivated by magnetizing or demagnetizing it, respectively.
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Erik Saathoff
Max Loutzenheiser
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