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1 freezing method of shaft-sinking
English-Russian mining dictionary > freezing method of shaft-sinking
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2 freezing method of shaft-sinking
English-Russian mining dictionary > freezing method of shaft-sinking
1 freezing method of shaft-sinking
English-Russian mining dictionary > freezing method of shaft-sinking
2 freezing method of shaft-sinking
English-Russian mining dictionary > freezing method of shaft-sinking