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12
military intelligence service
6
history
5
cosmonautics
5
reconnaissance
4
artificial satellites
3
tracking radiolocators
3
artificial satellites (construction)
2
army
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telescopes
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history of science and technology
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organization
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radiocommunications
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air force
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intelligence service
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detection of signal
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electromagnetic waves in dielectrics
1
aircraft construction
1
military aircrafts
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