| 摘要 |
1. Device for the remote detection of the presence of mail in a letter box, allowing the owner of the said letter box to be informed as to whether or not the mail has been placed therein, of the type including a detection means (1) proper, located in the letter box, transmitting data to a receiver (4) located at the owner's premises, characterised in that the mail present data is transmitted by radio means from the letter box to a radio receiver (4) located at the owner's premises, by means of a radio transmitter (3). <IMAGE>
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