| 摘要 |
A communication apparatus includes a support structure (41) that is fastenab le to a safety helmet (58). A vibration conduction microphone (54) is carried b y the support structure. The vibration conduction microphone and the speaker enclosure (43) are positioned so that, when the support structure is fastene d to the safety helmet, the vibration conduction microphone and the speaker enclosure come into contact with a rear of the wearer~s head.
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