Top IPC subclasses
1
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H01F
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2
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magnetsinductancestransformersselection of materials for their magnetic properties
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2
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H02M
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2
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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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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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F24S
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2
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