The second part is to make references to the principle of the magnetic card reader existed, and to make the magnetic card and magnetic card detector, whichfocused on appliance in engineering fields.
第二部分参考现有的磁卡机刷卡原理，制作了工程实用的磁卡及磁卡信号拾取装置。
In the same way, covering attendance machine and card reader with a metal or magnetic material will result in failure to work for the attendance machine.
同样道理，用金属或磁性物体遮挡考勤机和打卡头也会导致考勤机不能打卡工作。
In the same way, covering attendance machine and card reader with a metal or magnetic material will result in failure to work for the attendance machine.
同样道理，用金属或磁性物体遮挡考勤机和打卡头也会导致考勤机不能打卡工作。
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