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method and device for switching between operating on ersatzroehren and vice versa, as well as for the a - and shutdown or the use or the removal of one of two parallel pipes, preferably for equipment of electric nachrichtenuebertragungs and measurement technology
method and device for switching between operating on ersatzroehren and vice versa, as well as for the a - and shutdown or the use or the removal of one of two parallel pipes, preferably for equipment of electric nachrichtenuebertragungs and measurement technology