In the production of final petrol, organic lead, EDB, EDC and MTBE and other additives are blended in a sealed plant system, so as to avoid any problem of exposure for the employees. (chart 39-3).
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AntonijaIn the production of final petrol, organic lead, EDB, EDC, and MTBE and other additives are blended in a closed system of equippment/apparatus, so there is no exposure of employees/to avoid the exposure of the employees. (chart 39-3).I would omit the second-but-last "and" and add at least one comma: