The use of plant oil as fuel may seem insignificant today. But such products can in time become just as important as kerosene and these coal-tar-products of today. — Rudolf Diesel Copy Share Image
The automobile engine will come, and then I will consider my life's work complete. — Rudolf Diesel Copy Share
The use of plant oil as fuel may seem insignificant today. But such products can in time become just as important as kerosene and… — Rudolf Diesel Copy Share
