This was distributed widely over the country, the greatest producers, after Pennsylvania, being Illinois, West Virginia, Ohio, Alabama and Colorado. 佚名.神奇的知识之书.
And Edison's company is only one of many producers. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.
The above-mentioned states are the largest producers of salt in this country. 佚名.神奇的知识之书.
This also led to the invention of separate gas producers. 威廉·亨利·杜利特.世纪发明.