| 摘要 |
PROBLEM TO BE SOLVED: To provide a highly versatile key cylinder protective cap and a key cylinder protective system for securing a high security level. SOLUTION: This protective cap 11 is installed in a key cylinder, and hides and protects a key inserting port of the key cylinder. This protective cap 11 has a cap control microcomputer 12 and a transmission circuit 13. The cap control microcomputer 12 transmits a warning signal for indicating the removal of the cap from the transmission circuit 13 when the protective cap 11 is removed from the key cylinder. COPYRIGHT: (C)2004,JPO
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