| http://www.w3.org/ns/prov#value | - An electron gun according to a further embodiment of the present invention is shown in FIGS. 11 to 13 in which FIG. 11 is a longitudinal cross sectional view of the gun taken along a three in-line plane, FIG. 12 is a longitudinal cross sectional view of the gun taken along a plane including the tube axis and perpendicular to the three in-line plane and FIG. 13 is a transversal cross sectional view
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