| 摘要 |
The apparatus comprises a hook and a spring having an elongated arm portion. The spring is attached to the top of a conventional roadside mailbox with the arm parallel to the longitudinal centerline of the mailbox and with its end extending a short distance beyond the door at the end of the mailbox. The hook is attached to the door so that it can engage the end of the arm when the door is closed. The spring is such that when the door is opened and the hook is thereby moved to discharge from the end of the arm, the arm springs upward and comes to rest at a position up and away from the top of the mailbox, indicating that the door has been opened. The positions of the arm are made more clearly visible by tufts, tassels or the like attached to the arm near the end engaged by the hook. After the door is re-closed, the arm is manually reengaged with the hook.
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