发明名称 Telephone music-on-hold device
摘要 A telephone music device adapted to be inserted within the hollow portion of a telephone handset. The device draws power directly from the telephone line and requires no external power supply. When the handset is in a upright position, as normally utilized for a conversation, the telephone music device is electrically disconnected from the telephone circuit. However, when the handset is laid down such as on a table, the telephone music device becomes electrically interconnected with the telephone circuit. It draws power therefrom and generates a musical melody which is coupled to the telephone line. Alternate embodiments can be clipped to the handset or base of a modular telephone.
申请公布号 US4415776(A) 申请公布日期 1983.11.15
申请号 US19810255272 申请日期 1981.04.17
申请人 TANG, ROBIN K. L.;TANG, DONALD C. L. 发明人 TANG, ROBIN K. L.;TANG, DONALD C. L.
分类号 H04M1/21;H04M1/00;H04M1/738;H04M3/428;(IPC1-7):H04M1/00 主分类号 H04M1/21
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