US PATENT SUBCLASS 34 / 177
.~.~ With heating tubes

Current as of: June, 1999
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34 /   HD   DRYING AND GAS OR VAPOR CONTACT WITH SOLIDS

523  DF  APPARATUS {40}
165  DF  .~ Gravity flow type {7}
177.~.~ With heating tubes

DEFINITION

Classification: 34/177

(under subclass 165) Apparatus including in- direct heat exchange tubes for the material being treated.

(1) Note. Complete the search for combined material and heating tubes in this class, subclass 176.