Soviet Bomb Shelter Sign

Nearly everyone, it seems, is familiar with the American Kennedy-era yellow and black fallout shelter sign:

But it seems that hardly anyone, even older Russians, remembers the Soviet equivalent:
It reads:

BLAST SHELTER No. 28
OAO "Tiazhpromarmatura"
Keys are at Dormitory Security
Tel. 46-4-08
Under the leader of factory shop no. 33
V.I. Diudnev
Tel. 46-4-61