1 | Electrical engineering | Electrical machinery, apparatus, energy | F21H, F21K, F21L, F21S, F21V, F21W, F21Y, H01B, H01C, H01F, H01G, H01H, H01J, H01K, H01M, H01R, H01T, H02B, H02G, H02H, H02J, H02K, H02M, H02N, H02P, H05B, H05C, H05F, H99Z |

2 | Audio-visual technology | G09F, G09G, G11B, H04N 3, H04N 5, H04N 7, H04N 9, H04N 11, H04N 13, H04N 15, H04N 17, H04N 101, H04R, H04S, H05K |

3 | Telecommunications | G08C, H01P, H01Q, H04B, H04H, H04J, H04K, H04M, H04N 1, H04Q |

4 | Digital communication | H04L, H04N 21, H04W |

5 | Basic communication processes | H03B, H03C, H03D, H03F, H03G, H03H, H03J, H03K, H03L, H03M |

6 | Computer technology | G06C, G06D, G06E, G06F, G06G, G06J, G06K, G06M, G06N, G06T, G10L, G11C |

7 | IT methods for management | G06Q |

8 | Semiconductors | H01L |

9 | Instruments | Optics | G02B, G02C, G02F, G03B, G03C, G03D, G03F, G03G, G03H, H01S |

10 | Measurement | G01B, G01C, G01D, G01F, G01G, G01H, G01J, G01K, G01L, G01M, G01N 1, G01N 3, G01N 5, G01N 7, G01N 9, G01N 11, G01N 13, G01N 15, G01N 17, G01N 19, G01N 21, G01N 22, G01N 23, G01N 24, G01N 25, G01N 27, G01N 29, G01N 30, G01N 31, G01N 35, G01N 37, G01P, G01Q, G01R, G01S, G01V, G01W, G04B, G04C, G04D, G04F, G04G, G12B, G99Z |

11 | Analysis of biological materials | G01N 33 |

12 | Control | G05B, G05D, G05F, G07B, G07C, G07D, G07F, G07G, G08B, G08G, G09B, G09C, G09D |

13 | Medical technology | A61B, A61C, A61D, A61F, A61G, A61H, A61J, A61L, A61M, A61N, H05G |

14 | Chemistry | Organic fine chemistry | A61K 8, A61Q, C07B, C07C, C07D, C07F, C07H, C07J, C40B |

15 | Biotechnology | C07G, C07K, C12M, C12N, C12P, C12Q, C12R, C12S |

16 | Pharmaceuticals | A61K 6, A61K 9, A61K 31, A61K 33, A61K 35, A61K 36, A61K 38, A61K 39, A61K 41, A61K 45, A61K 47, A61K 48, A61K 49, A61K 50, A61K 51, A61K 101, A61K 103, A61K 125, A61K 127, A61K 129, A61K 131, A61K 133, A61K 135, A61P |

17 | Macromolecular chemistry, polymers | C08B, C08C, C08F, C08G, C08H, C08K, C08L |

18 | Food chemistry | A01H, A21D, A23B, A23C, A23D, A23F, A23G, A23J, A23K, A23L, C12C, C12F, C12G, C12H, C12J, C13B 10, C13B 20, C13B 30, C13B 35, C13B 40, C13B 50, C13B 99, C13D, C13F, C13J, C13K |

19 | Basic materials chemistry | A01N, A01P, C05B, C05C, C05D, C05F, C05G, C06B, C06C, C06D, C06F, C09B, C09C, C09D, C09F, C09G, C09H, C09J, C09K, C10B, C10C, C10F, C10G, C10H, C10J, C10K, C10L, C10M, C10N, C11B, C11C, C11D, C99Z |

20 | Materials, metallurgy | B22C, B22D, B22F, C01B, C01C, C01D, C01F, C01G, C03C, C04B, C21B, C21C, C21D, C22B, C22C, C22F |

21 | Surface technology, coating | B05C, B05D, B32B, C23C, C23D, C23F, C23G, C25B, C25C, C25D, C25F, C30B |

22 | Micro-structural and nano-technology | B81B, B81C, B82B, B82Y |

23 | Chemical engineering | B01B, B01D 1, B01D 3, B01D 5, B01D 7, B01D 8, B01D 9, B01D 11, B01D 12, B01D 15, B01D 17, B01D 19, B01D 21, B01D 24, B01D 25, B01D 27, B01D 29, B01D 33, B01D 35, B01D 36, B01D 37, B01D 39, B01D 41, B01D 43, B01D 57, B01D 59, B01D 61, B01D 63, B01D 65, B01D 67, B01D 69, B01D 71, B01F, B01J, B01L, B02C, B03B, B03C, B03D, B04B, B04C, B05B, B06B, B07B, B07C, B08B, C14C, D06B, D06C, D06L, F25J, F26B, H05H |

24 | Environmental technology | A62C, B01D 45, B01D 46, B01D 47, B01D 49, B01D 50, B01D 51, B01D 52, B01D 53, B09B, B09C, B65F, C02F, E01F 8, F01N, F23G, F23J, G01T |

25 | Mechanical engineering | Handling | B25J, B65B, B65C, B65D, B65G, B65H, B66B, B66C, B66D, B66F, B67B, B67C, B67D |

26 | Machine tools | A62D, B21B, B21C, B21D, B21F, B21G, B21H, B21J, B21K, B21L, B23B, B23C, B23D, B23F, B23G, B23H, B23K, B23P, B23Q, B24B, B24C, B24D, B25B, B25C, B25D, B25F, B25G, B25H, B26B, B26D, B26F, B27B, B27C, B27D, B27F, B27G, B27H, B27J, B27K, B27L, B27M, B27N, B30B |

27 | Engines, pumps, turbines | F01B, F01C, F01D, F01K, F01L, F01M, F01P, F02B, F02C, F02D, F02F, F02G, F02K, F02M, F02N, F02P, F03B, F03C, F03D, F03G, F03H, F04B, F04C, F04D, F04F, F23R, F99Z, G21B, G21C, G21D, G21F, G21G, G21H, G21J, G21K |

28 | Textile and paper machines | A41H, A43D, A46D, B31B, B31C, B31D, B31F, B41B, B41C, B41D, B41F, B41G, B41J, B41K, B41L, B41M, B41N, C14B, D01B, D01C, D01D, D01F, D01G, D01H, D02G, D02H, D02J, D03C, D03D, D03J, D04B, D04C, D04G, D04H, D05B, D05C, D06G, D06H, D06J, D06M, D06P, D06Q, D21B, D21C, D21D, D21F, D21G, D21H, D21J, D99Z |

29 | Other special machines | A01B, A01C, A01D, A01F, A01G, A01J, A01K, A01L, A01M, A21B, A21C, A22B, A22C, A23N, A23P, B02B, B28B, B28C, B28D, B29B, B29C, B29D, B29K, B29L, B99Z, C03B, C08J, C12L, C13B 5, C13B 15, C13B 25, C13B 45, C13C, C13G, C13H, F41A, F41B, F41C, F41F, F41G, F41H, F41J, F42B, F42C, F42D |

30 | Thermal processes and apparatus | F22B, F22D, F22G, F23B, F23C, F23D, F23H, F23K, F23L, F23M, F23N, F23Q, F24B, F24C, F24D, F24F, F24H, F24J, F25B, F25C, F27B, F27D, F28B, F28C, F28D, F28F, F28G |

31 | Mechanical elements | F15B, F15C, F15D, F16B, F16C, F16D, F16F, F16G, F16H, F16J, F16K, F16L, F16M, F16N, F16P, F16S, F16T, F17B, F17C, F17D, G05G |

32 | Transport | B60B, B60C, B60D, B60F, B60G, B60H, B60J, B60K, B60L, B60M, B60N, B60P, B60Q, B60R, B60S, B60T, B60V, B60W, B61B, B61C, B61D, B61F, B61G, B61H, B61J, B61K, B61L, B62B, B62C, B62D, B62H, B62J, B62K, B62L, B62M, B63B, B63C, B63G, B63H, B63J, B64B, B64C, B64D, B64F, B64G |

33 | Other fields | Furniture, games | A47B, A47C, A47D, A47F, A47G, A47H, A47J, A47K, A47L, A63B, A63C, A63D, A63F, A63G, A63H, A63J, A63K |

34 | Other consumer goods | A24B, A24C, A24D, A24F, A41B, A41C, A41D, A41F, A41G, A42B, A42C, A43B, A43C, A44B, A44C, A45B, A45C, A45D, A45F, A46B, A62B, A99Z, B42B, B42C, B42D, B42F, B43K, B43L, B43M, B44B, B44C, B44D, B44F, B68B, B68C, B68F, B68G, D04D, D06F, D06N, D07B, F25D, G10B, G10C, G10D, G10F, G10G, G10H, G10K |

35 | Civil engineering | E01B, E01C, E01D, E01F 1, E01F 3, E01F 5, E01F 7, E01F 9, E01F 11, E01F 13, E01F 15, E01H, E02B, E02C, E02D, E02F, E03B, E03C, E03D, E03F, E04B, E04C, E04D, E04F, E04G, E04H, E05B, E05C, E05D, E05F, E05G, E06B, E06C, E21B, E21C, E21D, E21F, E99Z |