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Pfeilerrückgewinnung f
construct.	working out of pillars
mining.	brokens; delayed pillar extraction; pillar drawing; pillar extraction; pillar mining; pillar retreating; pillar robbing; pillaring; posting; pulleying back; pulleying of pillars (stumps); robbery; robbing; robbing of pillars; stooping; stump pulling; winning of pillars

Pfeilerrückgewinnung: 3 phrases in 1 subject

Mining

3