| http://www.w3.org/ns/prov#value | - The advantages of the device according to the invention and especially according to the particular and preferred embodiments described above which will be described in detail hereinafter, can still be emphasized because with the said device a polarization voltage of 3 to 8 Volts has been obtained in a reproducible manner as against 40 to 100 Volts with the known method (in which an exceptional val
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