English translation for "bordandpillar system"

房柱式采煤法

Similar Words：

"bordalo" English translation, "bordalsvatn" English translation, "bordan" English translation, "bordanave" English translation, "bordandini" English translation, "bordang" English translation, "bordanzi" English translation, "bordari" English translation, "bordarier" English translation, "bordas" English translation