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This page contains all of the posts and discussion on MemeStreams referencing the following web page: Sound mirrors - Denge - Sound Radar. You can find discussions on MemeStreams as you surf the web, even if you aren't a MemeStreams member, using the Threads Bookmarklet.

Sound mirrors - Denge - Sound Radar
by CypherGhost at 11:03 pm EST, Mar 4, 2009

Before the advent of radar, the British used giant parabolic microphones to literally listen for enemy aircraft.

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