US PATENT SUBCLASS 48 / 189.3
.~ Auxilary air inlet

Current as of: June, 1999
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48 /   HD   GAS: HEATING AND ILLUMINATING

180.1  DF  MIXERS {9}
189.3.~ Auxilary air inlet

DEFINITION

Classification: 48/189.3

Auxiliary air inlet:

(under subclass 180.1) Apparatus having means for adding air to an existing mixture of air and a combustible gas.