raise borer
noun1
A machine used to excavate a circular hole between two levels of an underground mine without the use of explosives.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.
noun
A machine used to excavate a circular hole between two levels of an underground mine without the use of explosives.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.
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