| 摘要 |
Filter holder of the type consisting of a tubular device to which the relevant independent equipment or filter is coupled, characterized in that, unlike known filter holders which incorporate only the air-inlet passage or, at most, also the air-outlet passage, the present filter holder incorporates both passages and also the phonic membrane 9, the latter being interposed in the air-outlet passage and having, as does its protective support 21, individual openings 10, 22 which coincide for the aforesaid air outlet without the position of the relevant valve 25, which will close or open said openings, interfering in the circulation of sound, said membrane being fastened to its support 21 via its edges, both the outer periphery and that of its opening 10, by means of heat welding and without any other addition. <IMAGE>
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