发明名称 |
LINE CARD FOR KEY TELEPHONE SYSTEMS ADAPTED TO PROVIDE MUSIC DURING HOLD CONDITION |
摘要 |
<p>A key telephone system line card that includes provisions for supplying music to a connected subscriber when a telephone instrument associated with the line card is operated in the hold condition. The two winding line relay included in a conventional key telephone line card is utilized to provide transformer coupling from a music source to the connected telephone line.</p> |
申请公布号 |
CA1016283(A) |
申请公布日期 |
1977.08.23 |
申请号 |
CA19750219635 |
申请日期 |
1975.02.07 |
申请人 |
GTE AUTOMATIC ELECTRIC LABORATORIES INCORPORATED |
发明人 |
MARSHALL, RICHARD A. |
分类号 |
H04M9/00 |
主分类号 |
H04M9/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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