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senkfoerderer for gentle abwaertsfoerderung of coal by means of valves or cup, which under the zulaufsstelle in mutually parallel or parallel position vorbeigefuehrt are extraordinarily
senkfoerderer for gentle abwaertsfoerderung of coal by means of valves or cup, which under the zulaufsstelle in mutually parallel or parallel position vorbeigefuehrt are extraordinarily