US PATENT SUBCLASS 48 / 77
.~.~ Coal

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

61  DF  GENERATORS {4}
62 R  DF  .~ Cupola {18}
77.~.~ Coal

DEFINITION

Classification: 48/77

Generators in the form of a cupola or shaft in which coal is distilled or gasified.