| 64239 | Macadam, tarred, transportation of, by road in specialized vehicles | |
| 85123 | Machine operators, supplying of, for work assignments | |
| 83569 | Machine parts, magnetic testing of | |
| 83569 | Machine parts, radiographic testing of | |
| 83569 | Machine parts, ultrasonic testing of | |
| 73129 | Machine tools, rental or leasing of, without operator | |
| 86449 | Machinery and equipment manufacturing services, other | |
| 86530 | Machinery and equipment n.e.c., installation of | |
| 87159 | Machinery and equipment n.e.c., maintenance and repair of | |
| 71334 | Machinery insurance policies, underwriting of | |
| 62389 | Machinery n.e.c., other, mail order retail trade services of | |
| 62189 | Machinery n.e.c., other, non-specialized store retail trade services of | |
| 62489 | Machinery n.e.c., other, other non-store retail trade services of | |
| 62589 | Machinery n.e.c., other, retail trade services of, on a fee or contract basis | |
| 62289 | Machinery n.e.c., other, specialized store retail trade services of | |
| 61189 | Machinery n.e.c., other, wholesale trade services of, except on a fee or contract basis | |
| 61289 | Machinery n.e.c., other, wholesale trade services of, on a fee or contract basis | |
| 73129 | Machinery n.e.c., rental or leasing of, without operator | |
| 83812 | Machinery, photographing of | |
| 81130 | Machinery, research and experimental development concerning | |
| 87159 | Machine-tools, maintenance and repair of | |
| 85123 | Machinists, supplying of, for work assignments | |
| 62351 | Magazines, mail order retail trade services of | |
| 62151 | Magazines, non-specialized store retail trade services of | |
| 62451 | Magazines, other non-store retail trade services of | |
| 73290 | Magazines, rental or leasing of | |
| 62551 | Magazines, retail trade services of, on a fee or contract basis | |
| 62251 | Magazines, specialized store retail trade services of | |
| 61151 | Magazines, wholesale trade services of, except on a fee or contract basis | |
| 61251 | Magazines, wholesale trade services of, on a fee or contract basis | |
| 73124 | Magnetic readers, rental or leasing of, without operator | |
| 83569 | Magnetic testing of machine parts | |
| 83569 | Magnetic testing of structures | |
| 83520 | Magnetometric surveying services | |
| 85122 | Maids, supplying of, for employment by others | |
| 62382 | Mail order retail trade service of other transport equipment, except bicycles | |
| 62364 | Mail order retail trade service of paints | |
| 62385 | Mail order retail trade services of agricultural equipment | |
| 62385 | Mail order retail trade services of agricultural machinery | |
| 62319 | Mail order retail trade services of agricultural raw materials n.e.c. | |