| http://www.w3.org/ns/prov#value | - Moreover, the substrates on which the pattern of these electron-generating areas are realised are usually restricted to maximum dimensions, for example because the diameter is restricted to, for example 15 cm for glass plates on which a field emitter matrix is realised, or to approximately 5 cm for semiconductor substrates in which cold cathodes are realised so as to obtain a satisfactory yield.
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