| http://www.w3.org/ns/prov#value | - The strips of perforated sheet of the fingers of the cell B having thickness of 6 millimetres have been inserted into each finger in such a number as to obtain a section for the electric current passage similar to that of the couple of sheets according to the invention installed in each finger of the cell A. The openings, made on each strip on three rows, had a diameter of 8 millimetres.
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