PugJesus@lemmy.worldM to

HistoryPorn@lemmy.worldEnglish · 1 year ago

Two Imperial German sound locators for detecting airplanes, WW1, 1917

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Two Imperial German sound locators for detecting airplanes, WW1, 1917

PugJesus@lemmy.worldM to

HistoryPorn@lemmy.worldEnglish · 1 year ago

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I_Has_A_Hat@startrek.website
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11 months ago
Removed by mod
- Cethin@lemmy.zip
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  1 year ago
  I assume magnification to spot planes. Basically binoculars without the need to hold them.

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