![Acoustic listening devices developed for the Dutch Army, part of air defense systems research between World War I and II. [more]](http://26.media.tumblr.com/tumblr_l63e1sJ5gK1qz5k14o1_500.jpg)
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iiitsmark reblogged this from rocketboom and added:
comms dept for audio. Might help me hear the sound downstairs? Problem solved! Yah!
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rossfloate reblogged this from rocketboom and added:
Steampunk radar.
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