Top IPC subclasses
1
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C02F
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1
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Treatment of water, waste water, sewage, or sludge
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2
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F24J
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1
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Production or use of heat not otherwise provided for
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3
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A01G
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1
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Horticulture; cultivation of vegetables, flowers, rice, fruit, vines, hops, or seaweed; forestry; watering
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