They established chemical research laboratories which devised new and inexpensive methods for refining the product and developed invaluable byproducts, such as paraffin, naphtha, vaseline, and lubricating oils.

他们建立了化学研究实验室， 设计出新的廉价方法来提炼产品， 并开发了无价的副产品， 例如石蜡、石脑油、凡士林和润滑油。