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66
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microwave devices
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13
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design and construction
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9
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electric machinery
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7
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electric power systems
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7
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optoelectronic devices
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7
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semiconductors
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7
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electronics
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6
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millimeter waves
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6
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optical instruments
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6
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electric driving
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5
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optical wave guides
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5
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electric discharges through gases
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4
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electric power distribution
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4
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electric power transmission
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4
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electric utilities
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4
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3
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3
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3
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3
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3
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3
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3
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3
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3
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3
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3
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2
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2
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