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блокирующая цепь stresses
automat.	hold circuit; holding circuit
railw.	circuit of holding coil
tech.	holding; lock-out circuit
telecom.	blocking circuit
блокировать цепь
Makarov.	lock a circuit; block a circuit; hold a circuit
tech.	guard (в телефонии)
transp.	seize a circuit

блокирующая цепь: 3 phrases in 3 subjects

Automobiles	1
Chess	1
Technology	1