| 摘要 |
PROBLEM TO BE SOLVED: To solve defect such that a user speaks loudly to trouble others around him or her because his or her speaking mouth is distant from a mouthpiece (2) due to miniaturization of a portable telephone. SOLUTION: A transmission pipe (1) is set between the mouthpiece (2) of the portable telephone and his or her speaking mouth to efficiently send his or her voice to the mouthpiece (2) of the portable telephone, so that the transmitted voice can be made low. Thus, the defect that the user troubles others around him or her is solved.
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