00696naa#a2200181#i#4500001001500000005001700015011001400032100004100046101000800087102000700095200016800102210010100270215001000371608002700381675006700408700002200475856001700497EN\\bibl\8185820250208210139.6##a2412-9186##a20170625b2017####ek#y0engy0150####ca0#aRUS##aRU1#aDevelopment of signaling devices in the period of imperialism (1906-1917). Part 2: Regulation of traffic, electric rod system and open line blockeJournal article1#aSaint-PetersburgcFSBEI HE "Emperor Alexander I St. Petersburg State Transport University"d2017##a9 с.##aJournal article2local##aМеры безопасности. Сигналы. 656.25zRUS#1aLupalgNicolay V 4#aitt-pgups.ru