| 摘要 |
PROBLEM TO BE SOLVED: To enable easily multi-call without damaging portability with one portable radio terminal set, and a smooth call originating and terminating process with visual and sensual operation of an unskilled operator, regarding a portable radio terminal set capable of multi-call communication. SOLUTION: This portable radio terminal set is equipped with an off-hook key, an on-hook key and a multi-call key. In the case of first call originating, the off-hook key is pressed down after an originating number is selected, and a first circuit is connected. When the first circuit is connected, second call originating is made possible by pressing down the multi-call key.
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