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двухопорный клапан stresses
el.	double beat valve
electr.eng.	double-beat valve
mech.eng., obs.	d.b. valve
O&G	double seat valve
oil	double-seat valve
shipb.	beat drop valve; double-beat drop valve
transp.	double-seated valve

двухопорный клапан: 2 phrases in 1 subject

Mechanic engineering

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