| 摘要 |
A device is disclosed for use with heterodyne metal detectors to eliminate the indication of the detected presence of certain specific metals to the operator. A specially tuned circuit rotated adjacent the detector interacts with the circuitry of the detector to eliminate the audio and visual response of the detector to certain predetermined undesired metal objects. The device includes two coils, one of low impedance and high resistance and the other of high impedance and low resistance.
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