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GB1018569A
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Improvements in or relating to electric discharge devices
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GB929909A
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Improvements in or relating to cathode ray tubes
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GB932999A
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Improvements in or relating to thermionic valves
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GB933637A
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Improvements in or relating to periodic magnetic focussing devices
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GB894210A
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Improvements in or relating to electrostatic electron beam focussing devices
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GB832252A
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Improvements in or relating to thermionic valves incorporating metal-ceramic seals
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GB824784A
|
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Improvements in or relating to electric discharge devices
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GB807971A
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Improvements in or relating to methods of manufacturing thermionic valves
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GB820301A
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Improvements in or relating to thermionic valves
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GB712370A
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Improvements in or relating to systems for automatically controlling the pressure of a gas in an enclosure
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GB710419A
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Improvements in or relating to gas-filled thermionic valves
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GB658764A
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Improvements in or relating to t.r. switches
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GB636614A
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|
Improvements in and relating to thermionic valves
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GB631620A
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Improvements in or relating to gas-filled relay devices
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GB635000A
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Improvements in or relating to electromagnetic waveguides
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GB622001A
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Improvements in indirectly heated cathodes for electron discharge devices
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GB619736A
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Improvements in and relating to electric discharge devices
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GB619278A
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Improvements in and relating to thermionic valve oscillator circuits
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GB618319A
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Improvements in vapour-containing discharge devices
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GB617470A
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Improvements in and relating to thermionic cathodes
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