Derwent Classification System: Mechanical
Mechanical Engineering - all IPC B60-B68, E and F.
The IPCs are given in brackets.
| Q1 | VEHICLES IN GENERAL |
| Q11 | Wheels, tyres, connections (B60B-F). |
| Q12 | Suspension, heating, doors, screens (B60G-J). |
| Q13 | Transmissions, controls (B60K). |
| Q14 | Electric propulsion, seating (B60L-N). |
| Q15 | Transporting special loads (B60P). |
| Q16 | Vehicle lighting, signalling (B60Q). |
| Q17 | Vehicle parts, fittings, servicing (B60R,S). |
| Q18 | Brake-control systems (B60T). |
| Q19 | Air-cushion vehicles (B60V). |
| Q2 | SPECIAL VEHICLES |
| Q21 | Railways (B61). |
| Q22 | Hand, motor vehicles (B62B-D). |
| Q23 | Cycles B62H-M). |
| Q24 | Ships (B63). |
| Q25 | Aircraft, aviation, cosmonautics (B64). |
| Q3 | CONVEYING, PACKAGING, STORING |
| Q31 | Packaging, labelling (B65B, C). |
| Q32 | Containers (B65D01-37). |
| Q33 | Closures (B65D39-55). |
| Q34 | Packaging elements, types (B65D57-91). |
| Q35 | Refuse collection, conveyors (B65F, G). |
| Q36 | Handling thin materials (B65H). |
| Q37 | Container traffic (pre-1984 only) (B65H). |
| Q38 | Hoisting, lifting, hauling (B66). |
| Q39 | Liquid, handling, saddlery, upholstery (B67, 8). |
| Q4 | BUILDINGS, CONSTRUCTION |
| Q41 | Road, rail, bridge construction (E01). |
| Q42 | Hydraulic engineering, sewerage (E02, 3). |
| Q43 | General building constructions (E04B). |
| Q44 | Structural elements (E04C). |
| Q45 | Roofing, stairs, floors (E04D, F). |
| Q46 | Building aids, special structures (E04G, H). |
| Q47 | Locks, window and door fittings (E05). |
| Q48 | Blinds, shutters, ladders, doors (E06). |
| Q49 | Mining (E21). |
| Q5 | ENGINES, PUMPS |
| Q51 | Machines, engines in general (F01). |
| Q52 | Combustion engines, gas turbines (F02B-G). |
| Q53 | Jet engines, fuel supply (F02K, M). |
| Q54 | Starting, ignition (F02N, P). |
| Q55 | Machines, engines for liquids (F03). |
| Q56 | Pumps (F04). |
| Q57 | Fluid-pressure actuators (F15). |
| Q6 | ENGINEERING ELEMENTS |
| Q61 | Securing machine parts together (F16B). |
| Q62 | Shafts, bearings (F16C). |
| Q63 | Couplings, clutches, brakes, springs (F16D, F). |
| Q64 | Belts, chains, gearing (F16G, H). |
| Q65 | Pistons, cylinders, packing (F16J). |
| Q66 | Valves, taps cocks (F16K). |
| Q67 | Pipes, joints, fittings (F16L). |
| Q68 | Other engineering elements (F16M-T). |
| Q69 | Storing/distributing gas/liquid (F17). |
| Q7 | LIGHTING, HEATING |
| Q71 | Lighting (F21). |
| Q72 | Steam generation (F22). |
| Q73 | Combustion equipment/processes (F23). |
| Q74 | Heating, ranges, ventilating (F24). |
| Q75 | Refrigeration, liquefaction (F25). |
| Q76 | Drying (F26). |
| Q77 | Furnaces, kilns, ovens, retorts (F27). |
| Q78 | Heat exchange in general (F28). |
| Q79 | Weapons, ammunition, blasting (F41-2). |