US PATENT SUBCLASS 219 / 418
.~.~.~ With adjustable position heating unit or units
Current as of:
June, 1999
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219 /
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ELECTRIC HEATING
200
DF
HEATING DEVICES
{14}
385
DF
.~ Combined with container, enclosure, or support for material to be heated {12}
415
DF
.~.~ Deep well {4}
418
.~.~.~ With adjustable position heating unit or units
DEFINITION
Classification: 219/418
(under subclass 415) Subject matter including means whereby at least one heating unit of the device may be adjusted in position relative to the well structure.