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| 2421 | Xanthone insecticides, manufacturing | |
| 3311 | X-ray apparatus and tubes (e.g., control, industrial, medical, research), manufacturing | |
| 2429 | X-ray films and plates, sensitized, manufacturing | |
| 3311 | X-ray generators, manufacturing | |
| 7422 | X-ray inspection service | |
| 3311 | X-ray irradiation equipment, manufacturing | |
| 8519 | X-ray laboratories, medical | |
| 5150 | X-ray machines and parts, medical, wholesale | |
| 5150 | X-ray machines and related equipment and supplies, wholesale | |
| 3311 | X-ray tubes, manufacturing | |
| 3312 | X-Y recorders (i.e., plotters (except computer peripheral equipment)), manufacturing | |
| 2411 | Xylene, made from refined petroleum or natural gas liquids | |
| 2320 | Xylene, made in petroleum refineries | |
| 3692 | Xylophones, manufacturing | |
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