US PATENT SUBCLASS 110 / 159
.~.~ Portable

Current as of: June, 1999
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110 /   HD   FURNACES

147  DF  DRAFT REGULATORS {5}
*  DD  .~ Stack {2}
159.~.~ Portable

DEFINITION

Classification: 110/159

(under subclass 147) Devices applied to a stack for a limited time to assist the draft, especially in firing up a locomotive.