|
| 5150 | Machinery, farm, new or used, wholesale | |
| 5150 | Machines, commercial (except electronic computers), wholesale | |
| 5139 | Machines, household, electric, wholesale | |
| 5150 | Machines, office, wholesale | |
| 3312 | Machinists' precision measuring tools (except optical), manufacturing | |
| 5150 | Machinists' precision tools, wholesale | |
| 3312 | Machmeters, manufacturing | |
| 0500 | Mackerel, catching of | |
| 1810 | Mackinaws, men's and boys', cut and sewn from purchased fabric | |
| 1810 | Mackinaws, women's and misses', cut and sewn from purchased fabric | |
| 5239 | Macrame supplies, retail | |
| 5239 | Macramé, handicraft, retail | |
| 5211 | Mac's milk convience store | |
| 7430 | Magazine advertising representatives, independent | |
| 7430 | Magazine advertising representatives, offices of | |
| 2212 | Magazine publishers, all formats, publisher | |
| 2212 | Magazine publishers, all formats, publishing | |
| 2212 | Magazine publishers, all formats, publishing and printing combined | |
| 3610 | Magazine racks, wood, manufacturing | |
| 5239 | Magazine stands, retail | |
| 5259 | Magazine subscription sales (except mail-order), retail | |
| 5239 | Magazines and newspapers, retail | |
| 5251 | Magazines, mail-order, retail | |
| 2212 | Magazines, publisher | |
| 2212 | Magazines, publishing | |
| 2212 | Magazines, publishing and printing combined | |
| 5139 | Magazines, wholesale | |
| 3694 | Magic lanterns (toys), manufacturing | |
| 9214 | Magic shows | |
| 9214 | Magicians, independent | |
| 7523 | Magistrate courts | |
| 2692 | Magnesia refractory cement, manufacturing | |
| 2423 | Magnesia, medicinal, uncompounded, manufacturing | |
| 1429 | Magnesite mining | |
| 2692 | Magnesite refractories, manufacturing | |
| 2699 | Magnesite, crude (e.g., calcined, dead-burned, ground), manufacturing | |
| 2720 | Magnesium and magnesium alloy bar, sheet, strip and tubing, made from purchased metal or scrap | |
| 2411 | Magnesium carbonate, manufacturing | |
| 2732 | Magnesium castings (except die-castings), unfinished, manufacturing | |
| 2411 | Magnesium chloride, manufacturing | |
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