Personnel presence and location indicator for office or hospital - has letter box which is lockable by special key, key-operated clock display and paper note pad

摘要

The duty time indicator is equipped with a clock face (2) which is fitted to the front of a letter-box (1) and can be locked by its own key. The indicator is a time indicator, giving a time when an official or doctor is in attendance or is available. A disc (3) can be rotated to show the time of return or the time a visitor can be seen. There is also a pen so that written information can be displayed. ADVANTAGE - Simple design, requiring no power supply, and is not easy to tamper with.