US PATENT SUBCLASS 110 / 163
.~ Damper

Current as of: June, 1999
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110 /   HD   FURNACES

147  DF  DRAFT REGULATORS {5}
163.~ Damper

DEFINITION

Classification: 110/163

(under subclass 147) Devices movable in the path of the products of combustion for regulating the cross sectional area of said path or for closing one path in order to pass them through another or longer course.

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192, for time control devices.

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126, Stoves and Furnaces,

285+, especially subclasses 292-297 for dampers in the outlet-flue or stack with its operating mechanism.