US PATENT SUBCLASS 700 / 277
.~.~.~ Multiple zones


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700 /   HD   DATA PROCESSING: GENERIC CONTROL SYSTEMS OR SPECIFIC APPLICATIONS

90  DD  SPECIFIC APPLICATION, APPARATUS OR PROCESS {16}
275  DD  .~ Mechanical control system {5}
276  DD  .~.~ HVAC control {2}
277.~.~.~ Multiple zones