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专利名称：RECALL SYSTEM FOR OPERATOR OF CONTROL BOARD
发明人：USUI AKIHIRO
申请号：JP14343478宝宝磨牙是什么原因引起的
课堂上的喷射申请日：19781122
公开号：JPS5570158A
公开日：
童年优美句子
19800527
明信片的英语
专利内容由知识产权出版社提供
民主政体摘要：PURPOSE:To eliminate the extension ineffective lock by curing the on-hook state for the extension under the call by the operator until the operator gives answer and furthermore calling out the extension by the call signal if the operator gives answer then. CONSTITUTION:The repeating system of the private exchange consists of central office trunk COT, attendant board ATT, line frame LF, extension EXT and others. And trunk COT compris relays A-C, RC, R, RA and T plus call signal source IR and others. Thus if the dialling is given for recall of the operator, relay A releas with relay C operated. And relay RC operates when relay A operates again, and the recall display is given to ATT. Accordingly, relay RC is held when extension EXT is hooked on, and thus relays RA and R operate if the operator of ATT gives answer under the conditions. Thus the connection completes for the operator recall from the extension.
申请人：HITACHI LTD白娘
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