| http://www.w3.org/ns/prov#value | - The invention will be described further, by way of example, with reference to the accompanying drawings, in which: FIG. 1 is a longitudinal section through a preferred practical embodiment of the device of the invention assembled with a pre-filled MGS, the lower half of the figure being taken along a line offset to the upper half, so as to show the different configuration of the device at these po
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