| 摘要 |
<p>PURPOSE:To inform a fact that a return term expires to a book borrower by providing a book return device for giving a warning sound at the time point when a return scheduled day expires, in a book which becomes an object of lending service. CONSTITUTION:The device for comparing the present date data outputted from a timer 32, and date data of a return scheduled day registered in a memory 4, and outputting a warning sound from an output device in the case the present date exceeds the return scheduled day is provided in a book which becomes an object of lending service.</p> |
