19-17-skhema-4-soedineniya-zvukovogo-signala.html
19.17. The scheme 4. Connections of a sound signal
The scheme 4. Connections of a sound signal: 1 - a fusible insert (80); 2 - a fusible insert (10); 3 - the relay of a sound signal; 4 - a sound signal; 5 - a contact disk; 6 - the switch of a sound signal (the cars which have been not equipped with a pillow of safety); 7 - the switch of a sound signal (the cars equipped with the module of a pillow of safety)
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