US PATENT SUBCLASS 700 / 300
.~.~ For heating or cooling

Current as of: June, 1999
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700 /   HD   DATA PROCESSING: GENERIC CONTROL SYSTEMS OR SPECIFIC APPLICATIONS

90  DD  SPECIFIC APPLICATION, APPARATUS OR PROCESS {16}
299  DD  .~ Specific application of temperature responsive control system {1}
300.~.~ For heating or cooling