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возвратный клапан stresses
avia.	valve antiretour
hydr.	clapet du retenue; soupape du retenue
mech.eng.	soupape de retenue; soupape de retour
met.	clapet de retour
mil., arm.veh.	soupape de dérivation
tech.	clapet antiretour; clapet anti-retour (kosyak-napas); vanne de retour (I. Havkin)

возвратный клапан: 2 phrases in 2 subjects

Aviation	1
Technology	1