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to phrases
pillar caving
stresses
gas.proc.
обрушение охранного целика угля
(в подземном газогенераторе)
;
обрушение столба
(в подземном газогенераторе)
geol.
обрушение столба
mining.
выемка целика с обрушением
tech.
обрушение целика
pillar caving
:
4 phrases
in 2 subjects
Mining
3
Technology
1
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