Top IPC subclasses
1
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E04B
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2
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General building constructions; walls, e.g. partitions; roofs; floors; ceilings; insulation or other protection of buildings
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2
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C04B
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2
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Lime; magnesia; slag; cements; compositions thereof, e.g. mortars, concrete or like building materials; artificial stone; ceramics; refractories; treatment of natural stone
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