| http://www.w3.org/ns/prov#value | - Explained hereinbelow with reference to a sequence diagram shown in FIG. 8 is a case where the storage contents of the first line data memory datable 24 a of the line concentrator 10 a are updated in such an arrangement that the timer 16 is removed from the line concentrator 10 a illustrated in FIG. 1.
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