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<http://webisa.webdatacommons.org/133508825>	<http://www.w3.org/ns/prov#value>	" li l6 CIRCUIT I l 2 aoH T l l l T 22H HTG CON 24 J r' l l l o msa O V T 23-C I I3 I ZONES l\\. a 1 x \\J \\J a llkJ T lNG CONTROLLER SHEET 2 0? 3 m at ELECTRONIC CONTROL CIRCUIT WITH TIME DELAY OF MAIN AND FEEDBACK SIGNALS BACKGROUND AND SUMMARY OF THE INVENTION In zone control systems such as the system disclosed in the United States patents toElmer A. Carlson US Pat. No. 3,206,120 issued Sept. 14" .