| http://www.w3.org/ns/prov#value | - In the drawings: FIGURE 1 is a somewhat schematic view illustrating the control system of the present invention as applied to a hot water, or steam, heating system and cooling system including a boiler and at least one radiator; FIGURE 2 is a vertical, transverse section through a radiator control valve, taken on the line 2-2 of FIG- URE 1; FIGURE 3 is a longitudinal section through the radiator c
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