| X-RAY APPARATUS FOR OTHER USE (EXCEPT MEDICAL, SURGICAL, DENTAL OR VETERINARY) | 902219 |
| X-RAY APPARATUS MEDICAL, SURGICAL, DENTAL OR VETERINARY | 902212-14 |
| X-RAY APPARATUS, MEDICAL AND DENTAL USE | 902212-14 |
| X-RAY CAMERAS, CINEMATOGRAPHIC | 900719 |
| X-RAY CAMERAS, STILL | 900652 |
| X-RAY FILM (MOTION-PICTURE), UNDER 33-MM | 370210 |
| X-RAY FILM (STILL). SENSITIZED UNEXPOSED, MED EXC DENTAL | 370110 |
| X-RAY FILM PHOTOGRAPHIC IN ROLLS, UNEXPOSED, MEDICAL OTHER THAN DENTAL | 370210 |
| X-RAY FILM PHOTOGRAPHIC IN ROLLS, UNEXPOSED, OTHER THAN MEDICAL, INCLUDING DENTAL | 370210 |
| X-RAY FILM PROJECTORS, STILL | 900820 |
| X-RAY FILM, PHOTOGRAPHIC IN PLATES SENSITIZED BUT NOT EXPOSED, IN THE FLATS OTHER THAN MEDICAL, INCLUDING DEN | 370110 |
| X-RAY FILM, PHOTOGRAPHIC IN PLATES SENSITIZED BUT NOT EXPOSED, OTHER THAN MEDICAL, INCLUDING DENTAL | 370110 |
| X-RAY MOTION-PICTURE PROJECTORS, 16-MM | 900720 |
| X-RAY TABLETS | 300630 |
| X-RAY TUBES | 902230 |
| X-Y RECORDING INSTRUMENTS | 903083 |
| XANTHANEN-9-ONE | 293299 |
| XANTHATES | 293010 |
| XANTHOPHYLL (BETA, EPSILON-CAROTENE-3,3-DIOL) | 290619 |
| XENON | 280429 |
| XENON-133 | 284440 |
| XENOTIME ORE | 253090 |
| XYLENE, MONOCHLORD (CHLOROXYLENE - ALL ISOMERIC FORMS) | 290369 |
| XYLENE, NITRO | 290420 |
| XYLENE, ORTHO-XYLENE (1, 2-DIMETHYLBENZENE) (95% OR MORE BY WEIGHT OF XYLENE ISOMERS) | 290241 |
| XYLENE-SULFONIC ACIDS (ALL ISOMERIC FORMS) | 290410 |
| XYLENES, >50% BY WEIGHT XYLENES | 270730 |
| XYLENES, MIXED (95% OR MORE BY WEIGHT OF XYLENE ISOMERS) | 290244 |
| XYLENES, MIXED, >50% BY WEIGHT XYLENES | 270730 |
| XYLENOL (DIMETHYLPHENOLS), >50% BY WEIGHT DIMETHYLPHENOLS | 270730 |
| XYLENOL, CHLORO | 290810 |
| XYLENOLS (DIMETHYLPHENOLS), CHEMICALLY DEFINED COMPOUNDS | 293299 |
| XYLENOLS AND THEIR SALTS | 290714 |
| XYLIDINE | 292159 |
| XYLOCAINE PREPARATIONS, BULK | 300319-90 |
| XYLOCAINE, DOSAGE | 300410-90 |
| XYLOPHONES | 920600 |
| XYLOSE | 294000 |
