| SIC Code | Business or Product | Registrants |
|---|
|  | | |
| 2819 | Magnesium compounds, inorganic | * |
| 3364 | Magnesium die-castings | * |
| 3339 | Magnesium refining, primary | * |
| 3356 | Magnesium rolling, drawing, and extruding | * |
| 3341 | Magnesium smelting and refining, secondary | 11 |
| 3357 | Magnet wire, insulated | 28 |
| 3674 | Magnetic bubble memory device | 547 |
| 3824 | Magnetic counters | 11 |
| 3823 | Magnetic flow meters, industrial process type | 110 |
| 3542 | Magnetic forming machines | * |
| 3577 | Magnetic ink recognition devices, computer peripheral equipment | 235 |
| 2899 | Magnetic inspection oil and powder | * |
| 5065 | Magnetic recording tape – wholesale | 91 |
| 3695 | Magnetic recording tape, blank: reels, cassettes, and disks | 14 |
| 3845 | Magnetic resonance imaging device (diagnostic), nuclear | 309 |
| 3826 | Magnetic resonance imaging type apparatus, except diagnostic | 126 |
| 3572 | Magnetic storage devices for computers | 90 |
| 3652 | Magnetic tape, audio: prerecorded | 59 |
| 1011 | Magnetite mining | * |
| 3674 | Magnetohydrodynamic (MHD) devices | 547 |
________
* There are SEC Registrants, but only at the 2- or 3-digit SIC Code levels. |
