US PATENT SUBCLASS 48 / 72
.~.~ Coal and oil

Current as of: June, 1999
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48 /   HD   GAS: HEATING AND ILLUMINATING

61  DF  GENERATORS {4}
62 R  DF  .~ Cupola {18}
72.~.~ Coal and oil

DEFINITION

Classification: 48/72

Generators in the form of a cupola or shaft in which coal is distilled or gasified and into which oil or oil-vapor is introduced or oil-gas is added.