Remote temperature control system

Claim 1

IN A ZONED TEMPERATURE CONTROL SYSTEM, A PAIR OF CONTROL CONDUCTORS ADAPTED TO BE CONNECTED TO A DEVICE TO BE THERMOSTATICALLY CONTROLLED, A FIRST THERMOSTAT SWITCH, A SECOND THERMOSTAT SWITCH AT A DIFFERENT LOCATION, A FIRST RELAY HAVING CONTACTS CLOSING RESPONSIVE TO ENERGIZATION OF THE RELAY, MEANS TO HOLD SAID CONTACT CLOSED SUBSEQUENT TO SUCH ENERGIZATION, MEANS TO CONNECT SAID FIRST THERMOSTAT SWITCH TO SAID CONTROL CONDUCTORS RESPONSIVE TO CLOSURE OF SAID RELAY CONTACTS, A SECOND RELAY HAVING CONTACTS CLOSING RESPONSIVE TO THE ENERGIZATION OF SAID SECOND RELAY, MEANS TO CONNECT SAID SECOND THERMOSTAT SWITCH TO SAID CONTROL CONDUCTORS RESPONSIVE TO CLOSURE OF SAID SECOND-NAMED RELAY CONTACTS, MEANS TO HOLD SAID SECOND-NAMED RELAY CONTACTS CLOSED SUBSEQUENT TO ENERGIZATION OF SAID SECOND RELAY, MEANS TO OPEN ONE SET OF SAID RELAY CONTACTS WHEN THE OTHER SET OF RELAY CONTACTS IS CLOSED, A SOURCE OF CURRENT, RESPECTIVE CONTROL SWITCHES LOCATED PHYSICALLY ADJACENT THE THERMOSTAT SWITCHES, AND MEANS CONNECTING EACH RELAY TO SAID SOURCE OF CURRENT THROUGH A RESPECTIVE CONTROL SWITCH, WHEREBY THE RELAYS MAY BE SELECTIVELY ENERGIZED.