| http://www.w3.org/ns/prov#value | - bstantially in parallel with the surface of the substrate 1 and the plane including the surface of the electron-emitting member 4 substantially in parallel with the surface of the substrate 1), where substantially no scattering occurs on the gate electrode 2. [0079] The height s is dependent upon a ratio of the vertical electric field and the lateral electric field (vertical electric field intensi
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