prov:value
| - Examples of the materials constituting the thin film 204 including the electron emitting portion include metals such as Pd, Ru, Ag, Au, Ti, In, Cu, Cr, Fe, Zn, Sn, Ta, W, Pb, and the like; oxides such as PdO, SnO.sub.2, In.sub.2 O.sub.3, PbO,
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