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| XAH | Air/fuel ratio Alarm High |
| XAL | Air/fuel ratio Alarm Low |
| XBT | Expendable Bathythermograph |
| XCDT | Expendable Conductivity Depth Temperature Probe |
| XL | Exploration Licence |
| XLPE | Cross Link Polyethylene |
| XOV | Crossover Valve |
| XT | dual bore X-mas Tree |
| XV | motorised Valve |
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