| SIC Code | Business or Product | Registrants |
|---|
|  | | |
| 3844 | X-ray apparatus and tubes: medical, industrial, research, and control | 28 |
| 3861 | X-ray film | 66 |
| 3844 | X-ray generators | 28 |
| 8734 | X-ray inspection service, industrial | 51 |
| 8071 | X-ray laboratories, including dental (not manufacturing) | 181 |
| 5047 | X-ray machines and parts, medical – wholesale | 106 |
| 3861 | X-ray plates, sensitized | 66 |
| 3825 | X-Y recorders (plotters), except computer peripheral equipment | 93 |
| 2879 | Xanthone (formulated) | * |
| 2865 | Xylene, made in chemical plants | * |
| 3931 | Xylophones and parts | 10 |
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* There are SEC Registrants, but only at the 2- or 3-digit SIC Code levels. |
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