| 摘要 |
A muffler suitable for use in an internal combustion engine exhaust system has a tubular member extending the full length of an outer shell to provide a gas passage connecting the inlet end to the outlet end of the shell and has a reduced diameter central portion which is surrounded by an inner shell that communicates with the interior of the gas flow passage by means of perforations in the wall of the tubular member, the tubular member also containing perforations on opposite sides of the inner shell that open into a chamber between a tubular member and the outer shell.
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