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| 2411 | Magnesium compounds, not specified elsewhere by process, manufacturing | |
| 1320 | Magnesium concentrates, mining | |
| 2732 | Magnesium die-castings, unfinished, manufacturing | |
| 2720 | Magnesium foil, made by rolling purchased metal or scrap | |
| 2720 | Magnesium foil, made from purchased foil | |
| 1410 | Magnesium limestone, crude, mining | |
| 1320 | Magnesium ore mining | |
| 2720 | Magnesium rolling, drawing or extruding, purchased metal or scrap | |
| 2720 | Magnesium smelting and primary refining | |
| 1421 | Magnesium sulphate mine | |
| 2720 | Magnesium, recovering from scrap and/or alloying purchased metals | |
| 3130 | Magnet wire and cable, insulated, manufacturing | |
| 3130 | Magnet wire, insulated, made in aluminum wire drawing plants | |
| 3130 | Magnet wire, insulated, made in copper wire drawing plants | |
| 3130 | Magnet wire, insulated, made in non-ferrous (except aluminum, copper) wire drawing plants | |
| 3130 | Magnet wire, insulated, manufacturing | |
| 2429 | Magnetic and optical media, blank, manufacturing | |
| 3312 | Magnetic counters, manufacturing | |
| 3313 | Magnetic flow meters, industrial process type, manufacturing | |
| 2922 | Magnetic forming machines, metalworking, manufacturing | |
| 7421 | Magnetic geophysical surveying services | |
| 3000 | Magnetic ink recognition devices, computer peripheral equipment, manufacturing | |
| 2429 | Magnetic recording media for tapes, cassettes and disks, manufacturing | |
| 5150 | Magnetic recording tape, wholesale | |
| 3311 | Magnetic resonance imaging (MRI) medical diagnostic equipment, manufacturing | |
| 3312 | Magnetic resonance imaging (MRI) type apparatus (except medical diagnostic), manufacturing | |
| 3000 | Magnetic storage devices for computers, manufacturing | |
| 2230 | Magnetic tape, prerecorded audio, mass-reproducing | |
| 2429 | Magnetic tapes, cassettes and disks, blank, manufacturing | |
| 3000 | Magnetic/optical combination storage units for computers, manufacturing | |
| 1310 | Magnetite concentrate, mining | |
| 1310 | Magnetite mining | |
| 1310 | Magnetite ore mining | |
| 3312 | Magnetometers, manufacturing | |
| 7421 | Magnetometric survey services (except geophysical) | |
| 3210 | Magnetron tubes, manufacturing | |
| 3190 | Magnets, electro-, manufacturing | |
| 2691 | Magnets, permanent, ceramic or ferrite, manufacturing | |
| 3190 | Magnets, permanent, metallic, manufacturing | |
| 3320 | Magnifiers, vision correcting type, manufacturing | |
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