| 摘要 |
PROBLEM TO BE SOLVED: To provide an underwater mask which can be mounted by extremely simple work and with which divers can converse in a short distance without requiring special operation. SOLUTION: This underwater mask can receive air supply by a regulator and is provided with a megaphone in front of a mouth part of the diver, and the megaphone is constituted by providing a hollow loudspeaker cylinder extended outside and a diaphragm on an edge end of an opening part outside of the loudspeaker cylinder. COPYRIGHT: (C)2005,JPO&NCIPI
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