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устье штольни stresses
geol.	adit entrance; adit opening; portal; inby end; tunnel opening
goldmin.	portal of adit (Leonid Dzhepko); entry (MichaelBurov)
Makarov.	entrance of an adit
mining.	drift mouth; gallery entrance; adit entry; adit mouth; drift entrance; inbye end; mine portal
tech.	adit portal; tunnel portal; adit collar

устье штольни: 2 phrases in 1 subject

Mining

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