| http://www.w3.org/ns/prov#value | - Referring now to FIG. 3, there is shown a Key 14, the structure and operation of which is similar to the key depicted in FIGS. 2a and 2b and hereinbefore described except that the insulating layer 4 has been eliminated and the various conductors 6 and 10 and contacts 5 and 9 are attached directly to the substrate.
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