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Διαταξις προς παρεμβολην σηματων τροχαιας κινησεως εις διασταυρωσεις οδων τη βοηθεια δυο βαλβιδων (εγκαρσιων δοκων) τοποθετημενων εν των καταστρωματιτης οδου.