| 摘要 |
A telephone headset including a dialing mechanism for allowing a user to place and receive calls, without being disturbed by loud noises nearby, when the headset is connected to a telephone line. The headset also includes a signaling device for alerting the user to incoming calls when a switch on the headset is in one of two given states. A dial tone is obtained prior to making outgoing calls by placing the switch in its second state.
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