H. Oh, what we called it, I don't know what they call it this day and time. One place -- I went to Dayton, Ohio. And I believe that's the place where I saw that material being burned with oil, there. Then I went to another place -- you see, where I'd go, them people, I'd go to their office and then they'd take me to where they had sold machinery and it was in operation and so I caught on to all of them. They finally showed me one place that oil, another place they showed me gas they were using for fuel. Now, one place was Indianapolis, Indiana. Another place, Dayton, Ohio, is where I bought most of my machinery.