| http://www.w3.org/ns/prov#value | - BRIEF DESCRIPTION OF THE DRAWINGS These objects and other objects and advantages of the present invention will become more apparent upon reading of the following detailed description and the accompanying drawings in which: FIG. 1 is a scanned image of the surface of an electron emission film according to the embodiment 1 of the present invention, obtained by a scanning electron microscope; FIG. 2
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