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сужение ствола
 сужение ствола
dril. tight spot
| скважины
 скважина
gen. chink; crack; aperture; peep; rift; interstice

to phrases
сужение стволаstresses
dril. tight spot (MichaelBurov)
сужение ствола: 18 phrases in 6 subjects
Mining2
Oil / petroleum9
Oil and gas1
Sakhalin1
Technology1
Weapons and gunsmithing4