| 摘要 |
By providing an automatically activated positive indicator or signal which is responsive to only the use of a master key, a padlock construction is achieved which is highly effective for providing notice to the user whenever the padlock has been opened by said master key. In accordance with the present invention, the positive indicator or signal is constructed for being automatically activated whenever the master key is employed, with said indicator or signal being locked in its activated position, and capable of being re-set by only the user.
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