US PATENT SUBCLASS 48 / 74
.~.~ Refractory filling

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

61  DF  GENERATORS {4}
62 R  DF  .~ Cupola {18}
74.~.~ Refractory filling

DEFINITION

Classification: 48/74

Cupola structures having a filling of refractory material, such as brick, so as to be heated to a high temperature.

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