US PATENT SUBCLASS 110 / 150
.~ Steam injector

Current as of: June, 1999
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110 /   HD   FURNACES

147  DF  DRAFT REGULATORS {5}
150.~ Steam injector {1}
157  DF  .~.~> Feeding air {1}

DEFINITION

Classification: 110/150

(under subclass 147) Devices in which steam is injected into the path of the products of combustion to regulate its velocity.