| 摘要 |
A ciphered message contained in a radio signal is displayed as it is if a code number contained in a received radio signal does not coincide with a preliminarily registered code number. On the other hand, if the code number contained in the radio signal coincide with the preliminarily registered code number, the message is deciphered and displayed on a display portion when a code number input from an input portion coincides with a received code number.
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