Top IPC subclasses
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1
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H02M
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6
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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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|
2
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G05F
|
2
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systems for regulating electric or magnetic variables
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|
3
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H02J
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2
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circuit arrangements or systems for supplying or distributing electric powersystems for storing elec
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4
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H05B
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1
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electric heatingelectric lighting not otherwise provided for
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5
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A24B
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1
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manufacture or preparation of tobacco for smoking or chewingtobaccosnuff
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