Top IPC subclasses
1
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H01L
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3
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Semiconductor devices; electric solid state devices not otherwise provided for
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2
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A61N
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1
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electrotherapymagnetotherapyradiation therapyultrasound therapy
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3
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H02M
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1
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apparatus for conversion between ac and ac, between ac and dc, or between dc and dc, and for use wit
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4
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H01T
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1
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spark gapsovervoltage arresters using spark gapssparking plugscorona devicesgenerating ions to be in
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