Before the advent of radar, scouts were listening to enemy aircraft from the middle of World War I to the beginning of World War II, and this "passive acoustic positioning" loudspeaker was commonly used on the battlefield for listening
author：Miscellaneous talk about the little prince
Before the radar appeared, the scouts were listening to enemy aircraft
From the middle of World War I to the beginning of World War II, this "passive acoustic positioning" loudspeaker was a common device used on the battlefield to listen to enemy aircraft (1917-1940)
Before the advent of radar, scouts were listening to enemy aircraft from the middle of World War I to the beginning of World War II, and this "passive acoustic positioning" loudspeaker was commonly used on the battlefield for listening
Before the advent of radar, scouts were listening to enemy aircraft from the middle of World War I to the beginning of World War II, and this "passive acoustic positioning" loudspeaker was commonly used on the battlefield for listening
Before the advent of radar, scouts were listening to enemy aircraft from the middle of World War I to the beginning of World War II, and this "passive acoustic positioning" loudspeaker was commonly used on the battlefield for listening
Before the advent of radar, scouts were listening to enemy aircraft from the middle of World War I to the beginning of World War II, and this "passive acoustic positioning" loudspeaker was commonly used on the battlefield for listening
Before the advent of radar, scouts were listening to enemy aircraft from the middle of World War I to the beginning of World War II, and this "passive acoustic positioning" loudspeaker was commonly used on the battlefield for listening
Before the advent of radar, scouts were listening to enemy aircraft from the middle of World War I to the beginning of World War II, and this "passive acoustic positioning" loudspeaker was commonly used on the battlefield for listening
Before the advent of radar, scouts were listening to enemy aircraft from the middle of World War I to the beginning of World War II, and this "passive acoustic positioning" loudspeaker was commonly used on the battlefield for listening
Before the advent of radar, scouts were listening to enemy aircraft from the middle of World War I to the beginning of World War II, and this "passive acoustic positioning" loudspeaker was commonly used on the battlefield for listening
Before the advent of radar, scouts were listening to enemy aircraft from the middle of World War I to the beginning of World War II, and this "passive acoustic positioning" loudspeaker was commonly used on the battlefield for listening
