首页>
外国专利>
Circuit arrangement for the interrogation and further forwarding of on the lines and line by means of support by means of a lead of different valency existing calls vermittlungsplaetze a telecommunications -, in particular private branch exchange
Circuit arrangement for the interrogation and further forwarding of on the lines and line by means of support by means of a lead of different valency existing calls vermittlungsplaetze a telecommunications -, in particular private branch exchange