| http://www.w3.org/ns/prov#value | - Referring to the drawings, FIG. 1 is a schematic cross section of a conventional microwave vacuum tube device--here a TWT--comprising an evacuated tube 10, a source of electrons in the form of an electron gun 11, an input window 12 for introducing a microwave input signal, an interaction structure 13 where the electrons interact with the input signal, and a microwave output window 14 where microwa
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