| http://www.w3.org/ns/prov#value | - The step-forming section 45 is made of an insulator material such as SiO2 and formed there by vacuum deposition, printing, sputtering or some other appropriate technique to a thickness between several hundreds angstroms and tens of several micrometers, which is substantially equal to the distance L1 separating the electrodes of a flat electron-emitting device described earlier, although it is dete
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