| http://www.w3.org/ns/prov#value | - The invention may be performed in a variety of ways, five examples of the preparation of the lamina referred to being as follows: (1) The granules are spread in a single layer on a lamina of electrically insulating material, such as polythene, which can be penetrated by the granules by application of sufiicient pressure to the latter, and pressure is applied in any suitable manner to the granules
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