| http://www.w3.org/ns/prov#value | - FIG. 12 shows two thermometers AT and KT with inversely interconnectable temperature taps with an interposed adapter switch unit AS, a freezing protector GS for sanitary installations, a simple room thermometer RF without safety means and a control relay IR. At the right of FIG. 12 are all the elements controlled by the system, such as a burner, a reversing servo for the mixing valve, an impulse v
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