US PATENT SUBCLASS 236 / 45
DRAFT-OPERATED

Current as of: June, 1999
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236 /   HD   AUTOMATIC TEMPERATURE AND HUMIDITY REGULATION

45DRAFT-OPERATED

DEFINITION

Classification: 236/45

(under the class definition) Devices controlling the operation of a heater according to the draft.

SEE OR SEARCH CLASS

137, Fluid Handling,

98+, 458 to 460, 486+, 496, and 497+ for valves responsive to change in rate of flow.