| http://www.w3.org/ns/prov#value | - FIG. 2 is an example of a circuit which enables a selection to be made between the first of the configurations described above, in which the display image selector 43 is controlled manually, and one or other of the second, third and fourth configurations depending on which one has been incorporated into the system. 44 is a mode selection switch which is used to switch between the automatic and man
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