| 45269 | Magnetic ink recognition devices for automatic data processing machines (computers) | |
| 73124 | Magnetic readers, rental or leasing of, without operator | |
| 88747 | Magnetic resonance imaging (MRI) equipment manufacturing services | |
| 93196 | Magnetic resonance imaging (MRI) medical services | |
| 48121 | Magnetic resonance imaging apparatus | |
| 48121 | Magnetic resonance imaging apparatus (MRI) | |
| 47321 | Magnetic sound-reproducing apparatus for office or private use, not incorporating a sound-recording device | |
| 47321 | Magnetic sound-reproducing apparatus used for making records (preparation of soundtracks, reading of tapes, etc.), not incorporating a sound-recording device | |
| 47321 | Magnetic sound-reproducing apparatus used in recording studios (e.g., for broadcasts), not incorporating a sound-recording device | |
| 88749 | Magnetic storage media manufacturing services | |
| 45272 | Magnetic tape storage units for automatic data processing machines (computers) | |
| 83449 | Magnetic testing of machine parts | |
| 83449 | Magnetic testing of structures | |
| 14100 | Magnetite, not agglomerated (excl. that ground for use as pigments) | |
| 46910 | Magnetodynamos | |
| 44218 | Magneto-forming machines for working metal | |
| 48219 | Magnetometers | |
| 83412 | Magnetometric surveying services | |
| 46910 | Magnetos, ignition, for internal combustion engines | |
| 47140 | Magnetrons | |
| 46932 | Magnets, horseshoe, ceramic | |
| 46931 | Magnets, horseshoe, metallic | |
| 46932 | Magnets, permanent, ceramic, whether or not magnetized | |
| 46931 | Magnets, permanent, metallic, whether or not magnetized | |
| 46932 | Magnets, toy, ceramic | |
| 46931 | Magnets, toy, metallic | |
| 48315 | Magnifiers for office use | |
| 48315 | Magnifiers, hand | |
| 48315 | Magnifiers, pocket-type | |
| 37199 | Magnifying glasses, not optically worked | |
| 01929 | Maguey textile fibres, raw | |
| 26190 | Maguey textile fibres, tow or waste of, not spun | |
| 38590 | Mah-jong sets | |
| 44199 | Maies for winepresses | |
| 88767 | Mail handling machines (envelope stuffing, sealing and addressing machinery; opening, sorting, scanning) manufacturing services | |
| 62382 | Mail order retail trade service of other transport equipment, except bicycles | |
| 62364 | Mail order retail trade service of paints | |
| 62386 | Mail order retail trade services of agricultural equipment | |
| 62386 | Mail order retail trade services of agricultural machinery | |
| 62319 | Mail order retail trade services of agricultural raw materials n.e.c. | |