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A
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HUMAN NECESSITIES
B
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PERFORMING OPERATIONSTRANSPORTING
C
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CHEMISTRYMETALLURGY
C01
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CHEMISTRY
C01
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INORGANIC CHEMISTRY
C02
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TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
C02F
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TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (processes for making harmful chemical substances harmless, or less harmful, by effecting a chemical change in the substances A62D 3/00; separation, settling tanks or filter devices  B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F 9/04) [3]
C02F 1/00
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Treatment of water, waste water, or sewage (C02F 3/00-C02F 9/00 take precedence) [3, 2006.01, 2023.01]
C02F 1/02
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by heating [3, 2006.01, 2023.01]
C02F 1/04
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. . by distillation or evaporation [3, 2006.01, 2023.01]
C02F 1/06
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. . . Flash evaporation [3, 2006.01, 2023.01]
C02F 1/08
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. . . Thin film evaporation [3, 2006.01, 2023.01]
C02F 1/10
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. . . by direct contact with a particulate solid or with a fluid, as a heat transfer medium [3, 2006.01, 2023.01]
C02F 1/12
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. . . . Spray evaporation [3, 2006.01, 2023.01]
C02F 1/14
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. . . using solar energy [3, 2006.01, 2023.01]
C02F 1/16
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. . . using waste heat from other processes [3, 2006.01, 2023.01]
C02F 1/18
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. . . Transportable devices to obtain potable water [3, 2006.01, 2023.01]
C02F 1/20
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by degassing, i.e. liberation of dissolved gases [3, 2006.01, 2023.01]
C02F 1/22
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by freezing [3, 2006.01, 2023.01]
C02F 1/24
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by flotation (C02F 1/465 takes precedence) [3, 5, 2006.01, 2023.01]
C02F 1/26
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by extraction [3, 2006.01, 2023.01]
C02F 1/28
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by sorption (using ion-exchange C02F 1/42; sorbent compositions B01J) [3, 2006.01, 2023.01]
C02F 1/30
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by irradiation [3, 2006.01, 2023.01]
C02F 1/32
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. . with ultraviolet light [3, 2006.01, 2023.01]
C02F 1/34
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with mechanical oscillations [3, 2006.01, 2023.01]
C02F 1/36
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. . ultrasonic vibrations [3, 2006.01, 2023.01]
C02F 1/38
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by centrifugal separation [3, 2006.01, 2023.01]
C02F 1/40
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Devices for separating or removing fatty or oily substances or similar floating material (cleaning or keeping clear the surface of open water from oil or like materials E02B 15/04; devices in sewers for separating liquid or solid substances from sewage E03F 5/14) [3, 5, 2006.01, 2023.01]
C02F 1/42
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by ion-exchange [3, 2006.01, 2023.01]
C02F 1/44
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by dialysis, osmosis or reverse osmosis [3, 2006.01, 2023.01]
C02F 1/46
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by electrochemical methods [3, 5, 2006.01, 2023.01]
C02F 1/461
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. . by electrolysis [5, 2006.01, 2023.01]
C02F 1/463
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. . . by electrocoagulation [5, 2006.01, 2023.01]
C02F 1/465
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. . . by electroflotation [5, 2006.01, 2023.01]
C02F 1/467
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. . . by electrochemical disinfection [5, 2006.01, 2023.01]
C02F 1/469
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. . by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis [5, 2006.01, 2023.01]
C02F 1/48
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with magnetic or electric fields (C02F 1/46 takes precedence) [3, 2006.01, 2023.01]
C02F 1/50
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by addition or application of a germicide or by oligodynamic treatment (C02F 1/467 takes precedence) [3, 5, 2006.01, 2023.01]
C02F 1/52
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by flocculation or precipitation of suspended impurities [3, 2006.01, 2023.01]
C02F 1/54
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. . using organic material [3, 2006.01, 2023.01]
C02F 1/56
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. . . Macromolecular compounds [3, 2006.01, 2023.01]
C02F 1/58
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by removing specified dissolved compounds (using ion-exchange C02F 1/42; softening water C02F 5/00) [3, 2006.01, 2023.01]
C02F 1/60
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. . Silicon compounds [3, 2006.01, 2023.01]
C02F 1/62
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. . Heavy metal compounds [3, 2006.01, 2023.01]
C02F 1/64
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. . . of iron or manganese [3, 2006.01, 2023.01]
C02F 1/66
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by neutralisationpH adjustment (for degassing C02F 1/20; using ion-exchange C02F 1/42; for flocculation or precipitation of suspended impurities C02F 1/52; for removing dissolved compounds C02F 1/58) [3, 2006.01, 2023.01]
C02F 1/68
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by addition of specified substances, e.g. trace elements, for ameliorating potable water [3, 2006.01, 2023.01]
C02F 1/70
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by reduction [3, 2006.01, 2023.01]
C02F 1/72
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by oxidation [3, 2006.01, 2023.01]
C02F 1/74
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. . with air (aeration of stretches of water C02F 7/00) [3, 2006.01, 2023.01]
C02F 1/76
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. . with halogens or compounds of halogens [3, 2006.01, 2023.01]
C02F 1/78
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. . with ozone [3, 2006.01, 2023.01]
C02F 3/00
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Biological treatment of water, waste water, or sewage [3, 2006.01, 2023.01]
C02F 5/00
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Softening waterPreventing scaleAdding scale preventatives or scale removers to water, e.g. adding sequestering agents (softening using ion-exchange C02F 1/42) [3, 2006.01, 2023.01]
C02F 7/00
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Aeration of stretches of water [3, 2006.01]
C02F 9/00
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Multistage treatment of water, waste water or sewage [3, 2006.01, 2023.01]
C02F 11/00
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Treatment of sludgeDevices therefor [3, 2006.01]
C02F 101/00
Indexing scheme associated with groups C02F 1/00-C02F 11/00 relating to the nature of the contaminant in the water, waste water, sewage or sludge. [7]
C02F 101/00
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Nature of the contaminant [7, 2006.01]
C02F 103/00
Indexing scheme associated with groups C02F 1/00-C02F 11/00, relating to the nature of the water, waste water, sewage or sludge to be treated. [7]
C02F 103/00
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Nature of the water, waste water, sewage or sludge to be treated [7, 2006.01]
C03
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GLASSMINERAL OR SLAG WOOL
C04
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CEMENTSCONCRETEARTIFICIAL STONECERAMICSREFRACTORIES [4]
C05
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FERTILISERSMANUFACTURE THEREOF [4]
C06
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EXPLOSIVESMATCHES
C07
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ORGANIC CHEMISTRY [2]
C08
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ORGANIC MACROMOLECULAR COMPOUNDSTHEIR PREPARATION OR CHEMICAL WORKING-UPCOMPOSITIONS BASED THEREON
C09
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DYESPAINTSPOLISHESNATURAL RESINSADHESIVESCOMPOSITIONS NOT OTHERWISE PROVIDED FORAPPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
C10
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PETROLEUM, GAS OR COKE INDUSTRIESTECHNICAL GASES CONTAINING CARBON MONOXIDEFUELSLUBRICANTSPEAT
C11
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ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXESFATTY ACIDS THEREFROMDETERGENTSCANDLES
C12
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BIOCHEMISTRYBEERSPIRITSWINEVINEGARMICROBIOLOGYENZYMOLOGYMUTATION OR GENETIC ENGINEERING
C13
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SUGAR INDUSTRY [4]
C14
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SKINSHIDESPELTS OR LEATHER
C21
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METALLURGY
C21
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METALLURGY OF IRON
C22
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METALLURGYFERROUS OR NON-FERROUS ALLOYSTREATMENT OF ALLOYS OR NON-FERROUS METALS
C23
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COATING METALLIC MATERIALCOATING MATERIAL WITH METALLIC MATERIALCHEMICAL SURFACE TREATMENTDIFFUSION TREATMENT OF METALLIC MATERIALCOATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERALINHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL [2]
C25
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ELECTROLYTIC OR ELECTROPHORETIC PROCESSESAPPARATUS THEREFOR [4]
C30
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CRYSTAL GROWTH [3]
C40
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COMBINATORIAL TECHNOLOGY [2006.01]
C40
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COMBINATORIAL TECHNOLOGY [2006.01]
C99
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SUBJECT MATTER NOT OTHERWISE PROVIDED FOR IN THIS SECTION [2006.01]
D
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TEXTILESPAPER
E
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FIXED CONSTRUCTIONS
F
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MECHANICAL ENGINEERINGLIGHTINGHEATINGWEAPONSBLASTING
G
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PHYSICS
H
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ELECTRICITY

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