| 摘要 |
A sound attenuating adaptor for detachable connection to the receiver of a telephone handset consisting of a cap of resilient sound absorbing material which slips over the receiver of the handset. The cap is provided with a valve which, when the adaptor is pressed to a user's ear, deforms, causing the valve to open and permit the user to hear sound emitted from the receiver. The valve per se may be a slit in the outer end of the cap or a disc embedded therein, which slides on a tube when the cap is deformed to expose holes and allow escape of sound.
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