US PATENT SUBCLASS 48 / 201
.~ Coal and oil

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

197 R  DF  PROCESSES {15}
201.~ Coal and oil

DEFINITION

Classification: 48/201

Processes for making and combining coal and olefiant gases.

They may be made separately and united or made combined.