| http://www.w3.org/ns/prov#value | - DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION [0035] An electric switching device for alternating current of the type to which the invention is particularly well applicable is schematically illustrated in FIG. 1, namely a such that is described in the Swedish patent application 9904164-2 mentioned before, and which here is provided with an apparatus for predicting a zero-crossing
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