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слепой ствол stresses
geol.	bonstay; jack head pit; staple shaft; underground shaft
goldmin.	sub-vertical shaft (Leonid Dzhepko)
mining.	blind pit; staple; blind shaft; winze; dumby shaft; boustay; drop staple; interior shaft; internal shaft; jack pit; jack shaft; little wind; monkey shaft; pique; raise; shaft-raise; shank; staple pit; sunk shaft
mining., Makarov.	dummy shaft; way shaft
tech.	jackshaft

слепой ствол: 10 phrases in 3 subjects

Mining	7
Oil / petroleum	1
Technology	2