| 2720 | Tube, aluminum, made from purchased aluminum | |
| 2710 | Tube, iron or steel, made in steel mills | |
| 2520 | Tube, non-rigid plastics, manufacturing | |
| 2423 | Tuberculin (i.e., tuberculo-protein derived), manufacturing | |
| 8532 | Tuberculosis and respiratory diseases association | |
| 8511 | Tuberculosis hospital | |
| 3210 | Tubes, cathode ray, manufacturing | |
| 3150 | Tubes, electric light, manufacturing | |
| 3210 | Tubes, electron, manufacturing | |
| 5150 | Tubes, electronic (e.g., receiving, transmitting, industrial), wholesale | |
| 2102 | Tubes, fibre, made from purchased paperboard | |
| 2511 | Tubes, inner, manufacturing | |
| 5142 | Tubes, iron and steel, wholesale | |
| 3210 | Tubes, klystron, manufacturing | |
| 5030 | Tubes, tire, motor vehicle, wholesale | |
| 3311 | Tubes, X-ray, manufacturing | |
| 2720 | Tubing, copper and copper alloy, made from purchased metal or scrap | |
| 2899 | Tubing, flexible metal, manufacturing | |
| 5142 | Tubing, iron and steel, wholesale | |
| 2720 | Tubing, made from purchased non-ferrous (except aluminum, copper) metal or scrap | |
| 2710 | Tubing, mechanical and hypodermic sizes, cold-drawn stainless steel, made from purchased steel | |
| 5142 | Tubing, metal, wholesale | |
| 2519 | Tubing, rubber (except extruded, lathe-cut, moulded), manufacturing | |
| 2519 | Tubing, rubber, manufacturing | |
| 2710 | Tubing, seamless steel, made in steel mills | |
| 1711 | Tubing, seamless, cotton, broad-woven, weaving | |
| 2710 | Tubing, wrought iron or steel, made in steel mills | |
| 2899 | Tubs, laundry and bath, metal, manufacturing | |
| 2695 | Tubs, laundry, concrete, manufacturing | |
| 4520 | Tuck pointing, contractors | |
| 4520 | Tuckpointing, construction | |
| 2926 | Tufting machinery for textiles, manufacturing | |
| 7112 | Tugboat leasing (except financial) without operator | |
| 6303 | Tugboat service, harbour operations | |
| 3511 | Tugboats, building | |
| 2520 | Tumblers, plastics, manufacturing | |
| 2892 | Tumbling (i.e., cleaning and polishing) metals and metal products, for the trade | |
| 0500 | Tuna fishing | |
| 0111 | Tung nut groves and farms | |
| 2411 | Tungstates (e.g., ammonium tungstate, sodium tungstate), manufacturing | |