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In trademark law, a "trademark class" refers to a category under which goods or services are classified. Trademark classes are used to categorize the different types of products or services that a trademark may cover. Each class represents a distinct group of goods or services.

The classification system is essential because it helps in organizing trademarks into specific groups based on their nature, which simplifies the registration and search processes. The classification system also ensures that trademarks are adequately categorized for legal and administrative purposes.

There are 45 trademark classes in total, divided into 34 classes for goods and 11 classes for services. Here is a general overview of these classes:

Trademark Classes for Goods (Classes 1-34):
1. Chemicals: Includes chemicals used in industry, science, photography, agriculture, horticulture, and forestry; unprocessed artificial resins, unprocessed plastics; manures; fire extinguishing compositions; tempering and soldering preparations; chemical substances for preserving foodstuffs; tanning substances; adhesives used in industry.
   
2. Paints: Includes paints, varnishes, lacquers; preservatives against rust and against deterioration of wood; colorants; mordants; raw natural resins; metals in foil and powder form for painters, decorators, printers, and artists.
   
3. Cosmetics and Cleaning Preparations: Includes cosmetics, hair lotions; dentifrices.
   
4. Lubricants and Fuels: Includes industrial oils and greases; lubricants; dust absorbing, wetting, and binding compositions; fuels (including motor spirit) and illuminants; candles and wicks for lighting.
   
5. Pharmaceuticals: Includes pharmaceuticals, medical and veterinary preparations; sanitary preparations for medical purposes; dietetic food and substances adapted for medical or veterinary use, food for babies; dietary supplements for humans and animals; plasters, materials for dressings; material for stopping teeth, dental wax; disinfectants; preparations for destroying vermin; fungicides, herbicides.
   
6. Metals: Includes common metals and their alloys; metal building materials; transportable buildings of metal; materials of metal for railway tracks; non-electric cables and wires of common metal; ironmongery, small items of metal hardware; pipes and tubes of metal; safes; goods of common metal not included in other classes; ores.
   
7. Machinery: Includes machines and machine tools; motors and engines (except for land vehicles); machine coupling and transmission components (except for land vehicles); agricultural implements other than hand-operated; incubators for eggs.
   
8. Hand Tools: Includes hand tools and implements (hand-operated); cutlery; side arms; razors.
   
9. Electrical and Scientific Apparatus: Includes scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signaling, checking (supervision), life-saving, and teaching apparatus and instruments; apparatus and instruments for conducting, switching, transforming, accumulating, regulating, or controlling electricity; apparatus for recording, transmission, or reproduction of sound or images; magnetic data carriers, recording discs; automatic vending machines and mechanisms for coin-operated apparatus; cash registers, calculating machines, data processing equipment, computers; fire-extinguishing apparatus.
   
10. Medical Apparatus: Includes surgical, medical, dental, and veterinary apparatus and instruments, artificial limbs, eyes, and teeth; orthopedic articles; suture materials.
   
11. Environmental Control Apparatus: Includes apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, water supply, and sanitary purposes.
   
12. Vehicles: Includes vehicles; apparatus for locomotion by land, air, or water.
   
13. Firearms: Includes firearms; ammunition and projectiles; explosives; fireworks.
   
14. Jewelry: Includes precious metals and their alloys and goods in precious metals or coated therewith, not included in other classes; jewelry, precious stones; horological and chronometric instruments.
   
15. Musical Instruments: Includes musical instruments.
   
16. Paper Goods and Printed Matter: Includes paper, cardboard, and goods made from these materials, not included in other classes; printed matter; bookbinding material; photographs; stationery; adhesives for stationery or household purposes; artists' materials; paintbrushes; typewriters and office requisites (except furniture); instructional and teaching material (except apparatus); plastic materials for packaging (not included in other classes); printers' type; printing blocks.
   
17. Rubber Goods: Includes rubber, gutta-percha, gum, asbestos, mica, and goods made from these materials and not included in other classes; plastics in extruded form for use in manufacture; packing, stopping, and insulating materials; flexible pipes, not of metal.
   
18. Leather Goods: Includes leather and imitations of leather, and goods made of these materials and not included in other classes; animal skins, hides; trunks and traveling bags; umbrellas, parasols, and walking sticks; whips, harness, and saddlery.
   
19. Non-Metallic Building Materials: Includes building materials (non-metallic); non-metallic rigid pipes for building; asphalt, pitch, and bitumen; non-metallic transportable buildings; monuments, not of metal.
   
20. Furniture and Articles Not Otherwise Classified: Includes furniture, mirrors, picture frames; goods (not included in other classes) of wood, cork, reed, cane, wicker, horn, bone, ivory, whalebone, shell, amber, mother-of-pearl, meerschaum, and substitutes for all these materials, or of plastics.
   
21. Housewares and Glass: Includes household or kitchen utensils and containers; combs and sponges; brushes (except paint brushes); brush-making materials; articles for cleaning purposes; steel wool; unworked or semi-worked glass (except glass used in building); glassware, porcelain, and earthenware not included in other classes.
   
22. Ropes and Cordage: Includes ropes, string, nets, tents, awnings, tarpaulins, sails, sacks, and bags (not included in other classes); padding and stuffing materials (except of rubber or plastics); raw fibrous textile materials.
   
23. Yarns and Threads: Includes yarns and threads, for textile use.
   
24. Fabrics: Includes textiles and textile goods, not included in other classes; bed and table covers.
   
25. Clothing: Includes clothing, footwear, headgear.
   
26. Fancy Goods: Includes lace and embroidery, ribbons and braid; buttons, hooks and eyes, pins and needles; artificial flowers.
   
27. Floor Coverings: Includes carpets, rugs, mats, and matting, linoleum and other materials for covering existing floors; wall hangings (non-textile).
   
28. Toys and Sporting Goods: Includes games and playthings; gymnastic and sporting articles not included in other classes; decorations for Christmas trees.
   
29. Meats and Processed Foods: Includes meat, fish, poultry, and game; meat extracts; preserved, frozen, dried, and cooked fruits and vegetables; jellies, jams, compotes; eggs, milk, and milk products; edible oils and fats.
   
30. Staple Foods: Includes coffee, tea, cocoa, sugar, rice, tapioca, sago, artificial coffee; flour and preparations made from cereals, bread, pastry, and confectionery, ices; honey, treacle; yeast, baking powder; salt, mustard; vinegar, sauces (condiments); spices; ice.
   
31. Natural Agricultural Products: Includes agricultural, horticultural, and forestry products and grains not included in other classes; live animals; fresh fruits and vegetables; seeds, natural plants, and flowers; foodstuffs for animals, malt.
   
32. Light Beverages: Includes beers; mineral and aerated waters and other non-alcoholic drinks; fruit drinks and fruit juices; syrups and other preparations for making beverages.
   
33. Wines and Spirits: Includes alcoholic beverages (except beers).
   
34. Tobacco and Smokers' Articles: Includes tobacco; smokers' articles; matches.

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Trademark Classes for Services (Classes 35-45):
35. Advertising and Business Services: Includes advertising; business management; business administration; office functions.
   
36. Insurance and Financial Services: Includes insurance; financial affairs; monetary affairs; real estate affairs.
   
37. Building and Construction Services: Includes building construction; repair; installation services.
   
38. Telecommunications Services: Includes telecommunications.
   
39. Transportation and Storage Services: Includes transport; packaging and storage of goods; travel arrangement.
   
40. Treatment of Materials Services: Includes treatment of materials.
   
41. Education and Entertainment Services: Includes education; providing of training; entertainment; sporting and cultural activities.
   
42. Computer and Scientific Services: Includes scientific and technological services and research and design relating thereto; industrial analysis and research services; design and development of computer hardware and software.
   
43. Hotels and Restaurants Services: Includes services for providing food and drink; temporary accommodation.
   
44. Medical and Beauty Services: Includes medical services; veterinary services; hygienic and beauty care for human beings or animals; agriculture, horticulture, and forestry services.
   
45. Legal and Security Services: Includes legal services; security services for the protection of property and individuals.

Each trademark application must specify the class or classes that the trademark will cover. It's crucial to select the correct class(es) that accurately describe the goods or services associated with your trademark to ensure proper protection and registration.