| 摘要 |
A device for use in recording and reading a predetermined sequence such as a personal identification number associated with a credit card comprises a first member 12 in the form of a substrate carrying potential elements of the sequence and a second member 22 for recording the relative positions of the individual elements of the desired sequence. The substrate also has means for identifying at least one location on the substrate, such as column and row identifiers 14, 16, so that the second member may be positioned at a predetermined location relative to the substrate in order to identify the desired sequence. The predetermined location of the second member relative to the substrate is known only to the user of the device. The substrate may be transparent and the second member located behind it or the second member may be transparent and located in front. Alternatively, (Fig. 6) the substrate may be transparent with through holes adjacent respective elements for easy marking of the second member. The second member may be attached to the credit card to which it relates by adhesive. <IMAGE>
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