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== Coal tar == ...liquid which is a by-product of the process of [[coal gasification]] and [[coal carbonization]]. It is historically known for its use in medical treatments

...ord "naphtha" (νάφθα), which was used to refer to any sort of petroleum or pitch. ...ral gas condensates]], petroleum distillates, and the distillation of coal tar and peat. It is used diversely in different industries and regions to refer