US PATENT SUBCLASS 110 / 148
.~ Separation of gases

Current as of: June, 1999
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110 /   HD   FURNACES

147  DF  DRAFT REGULATORS {5}
148.~ Separation of gases

DEFINITION

Classification: 110/148

(under subclass 147) Devices for separating the heavy gases and drawing them off, allowing only the lighter gases to pass through the stack.