US PATENT SUBCLASS 48 / 213
.~.~ Gas injected

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

197 R  DF  PROCESSES {15}
211  DF  .~ Oil {2}
213.~.~ Gas injected

DEFINITION

Classification: 48/213

Processes wherein oil and gas are injected into a highly heated retort.