Derwent Classification System: General
Human necessities, performing operations - all IPC A, excluding A01N, A21, A23, A61K; All IPC B02-B44, excluding B29. All IPC G02, G03, G09, G10.
The IPCs are given in brackets.
| P1 | AGRICULTURE, FOOD, TOBACCO |
| P11 | Soil working, planting (A01B, C). |
| P12 | Harvesting (A01D, F). |
| P13 | Plant culture, dairy products (A01G, H, J). |
| P14 | Animal care (A01K, L, M). |
| P15 | Tobacco (A24). |
| P2 | PERSONAL, DOMESTIC |
| P21 | Wearing apparel (A41, 2). |
| P22 | Footwear (A43). |
| P23 | Haberdashery, jewellery (A44). |
| P24 | Hand, travelling articles, brushes (A45, 6). |
| P25 | Office furniture (A47B). |
| P26 | Chairs, sofas, beds (A47C, D). |
| P27 | Shop, household, furnishings (A47F, G, H). |
| P28 | Kitchen, sanitary equipment (A47J, K, L). |
| P3 | HEALTH, AMUSEMENT |
| P31 | Diagnosis, surgery (A61B). |
| P32 | Dentistry, bandages, veterinary, prosthesis (A61C, D, F). |
| P33 | Medical aids, oral administration (A61G, H, J). |
| P34 | Sterilising, syringes, electrotherapy (A61L, M, N). |
| P35 | Life-saving, fire-fighting (A62). |
| P26 | Sports, games, toys (A63). |
| P4 | SEPARATING, MIXING |
| P41 | Crushing: centrifuging, separating solids (B02, 3, 4). |
| P42 | Spraying, atomising (B05). |
| P43 | Sorting, cleaning, waste disposal (B06, 7, 8, 9). |
| P5 | SHAPING METAL |
| P51 | Rolling, drawing, extruding (B21B, C). |
| P52 | Metal punching, working, forging (B21D-L). |
| P53 | Metal casting, powder metallurgy (B22). |
| P54 | Metal milling, machining, electroworking (23B-H). |
| P55 | Soldering, welding metal (B23K). |
| P56 | Machine tools (B23P,Q). |
| P6 | SHAPING NON-METAL |
| P61 | Grinding, polishing (B24). |
| P62 | Hand tools, cutting (B25, 6). |
| P63 | Working, preserving wood (B27). |
| P64 | Working cement, clay, stone (B28). |
| P7 | PRESSING, PRINTING |
| P71 | Presses (B30). |
| P72 | Working paper (B31). |
| P73 | Layered products (B32). |
| P74 | Printing: lining machines (B41B - G). |
| P75 | Typewriters, stamps, duplicators (B41J-N). |
| P76 | Books, special printed matter (B42). |
| P77 | Writing, drawing appliances (B43). |
| P78 | Decorative art (B44). |
| P8 | OPTICS, PHOTOGRAPHY, GENERAL |
| P81 | Optics (G02). |
| P82 | Photographic apparatus (G03B). |
| P83 | Photographic processes, compositions (G03C). |
| P84 | Other photographic (G03D-H). |
| P85 | Education, cryptography, adverts. (G09). |
| P86 | Musical instruments, acoustics (G10). |