BUFFINGTON, Circuit Judge.
This patent concerns the poker mechanism used in making producer gas to stir up the coal bed and prevent fuel surface caking. By reference to the elaborate opinion of the trial judge, that industry will be fully understood and needless repetition avoided. It suffices to say gas-producing coal is fed into a circular tank lined with fire brick, and is burned from below and the gas of combustion is carried off from the surface. As the burning...
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