Japan seems to have alot of sirens. Were these installed after or during WW2 or were there air raid sirens before those sirens?
@fukumaru.1224Ай бұрын
Unlike the disaster prevention radio installed by municipalities, this siren is a broadcast speaker used when the river is about to overflow. The siren was also installed during World War II, but it was updated because it was old. I think most of it has been used since around 2010.