| 3000 | Label making equipment, hand-held, manufacturing | |
| 2919 | Labelling (i.e., packaging machinery), manufacturing | |
| 7495 | Labelling services | |
| 1712 | Labels, cotton, printing, for the trade | |
| 2109 | Labels, gummed, made from purchased paper | |
| 2109 | Labels, printing on a job-order basis | |
| 1729 | Labels, weaving | |
| 5131 | Labels, woven, wholesale | |
| 8519 | Laboratories, biological, medical, X-ray (picture and treatment) | |
| 7310 | Laboratories, biology research and development | |
| 8519 | Laboratories, blood bank | |
| 8519 | Laboratories, combined medical and radiological | |
| 8519 | Laboratories, dental-X-ray | |
| 4520 | Laboratories, manufacturing facility, construction | |
| 7310 | Laboratories, physical research and development | |
| 7422 | Laboratories, product testing | |
| 8519 | Laboratories, radiological, medical | |
| 3312 | Laboratory analytical instruments (except optical), manufacturing | |
| 1533 | Laboratory animal feeds, manufacturing | |
| 0122 | Laboratory animal production (e.g., rats, mice, guinea pigs) | |
| 1810 | Laboratory clothing, manufacturing | |
| 1810 | Laboratory coats, men's and boys', cut and sewn from purchased fabric | |
| 1810 | Laboratory coats, women's, misses' and girls', cut and sewn from purchased fabric | |
| 5150 | Laboratory equipment (except medical or dental), wholesale | |
| 5150 | Laboratory equipment, dental and medical, wholesale | |
| 5150 | Laboratory equipment, wholesale | |
| 2914 | Laboratory furnaces, manufacturing | |
| 4530 | Laboratory furniture and equipment, installation | |
| 2610 | Laboratory glassware (e.g., beakers, test tubes, vials), made in glass making plants | |
| 2610 | Laboratory glassware (e.g., test tubes, vials, beakers), made from purchased glass | |
| 5150 | Laboratory instruments and apparatus, wholesale | |
| 8519 | Laboratory services, medical | |
| 9211 | Laboratory services, motion picture | |
| 3312 | Laboratory standards testing equipment (e.g., capacitance, electrical resistance, inductance), manufacturing | |
| 7422 | Laboratory testing service (except clinical and veterinary) | |
| 7422 | Laboratory, food testing | |
| 9120 | Labour federation | |
| 7491 | Labour leasing services (providing permanent employees paid by supplying company but under the supervision of the hiring company) | |
| 7491 | Labour pools (except farm labour) | |
| 7414 | Labour relation consulting services | |