US PATENT SUBCLASS 166 / 59
.~ Burner in well

Current as of: June, 1999
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166 /   HD   WELLS

57  DF  WITH HEATING, REFRIGERATING OR HEAT INSULATING MEANS {5}
59.~ Burner in well

DEFINITION

Classification: 166/59

(under subclass 57) Devices comprising means for burning fuel in the well, the fuel being fed to the burner from a source outside of the well.