- air brattices
- • вентилационно платно
English-Bulgarian polytechnical dictionary . 2013.
air brattices
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Brattice — A brattice is a partition used in mining. It is built between columns of a sub surface mine to direct air for ventilation. Depending on the type of mine and how the operation is run, brattices can be permanent (concrete block, tailings, or wood)… … Wikipedia
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