US PATENT SUBCLASS 202 / 244
.~.~.~.~ Tunnel heads and lids

Current as of: June, 1999
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202 /   HD   DISTILLATION: APPARATUS

81  DF  APPARATUS {4}
239  DF  .~ Elements {10}
242  DF  .~.~ Closures {5}
*  DD  .~.~.~ Dome ovens {3}
244.~.~.~.~ Tunnel heads and lids

DEFINITION

Classification: 202/244

Patents showing the structure of the openings for charging dome ovens, the air and gas flues surrounding these, the castings or other devices inserted for their protection, and the lids closing the charging holes.