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GB430179A
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Improvements in or relating to television systems
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GB412794A
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Improvements in or relating to television systems
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GB399469A
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Improvements in or relating to television systems
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GB396422A
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Improvements in or relating to cathode ray apparatus
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GB385721A
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Improvements in the manufacture of wire wound coils and the like
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IE13268L
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Screened grid valves
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GB392591A
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Improvements in or relating to thermionic valves
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GB368408A
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Improvements in or relating to thermionic valves of the screened grid type
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GB368407A
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An improved method of and means for assembling electrodes in thermionic valves
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GB361867A
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Improvements in or relating to thermionic valves
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GB340212A
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Improved cathode for thermionic devices and method of manufacturing the same
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GB310760A
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Improvements in or relating to thermionic valves
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GB297886A
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Improvements in or relating to thermionic valves
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GB253668A
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Improved method of and means for mounting filaments in thermionic valves and the like
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GB240078A
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Improvements in or relating to thermionic valves
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GB251073A
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Improvements in or relating to thermionic valves
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GB249367A
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Improvements in or relating to thermionic valves
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GB244864A
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A improved method of and means for supporting electrodes in thermionic valves and the like
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GB246538A
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Improvements in or relating to electrical discharge lamps
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GB240606A
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An improved method of and means for preventing unauthorised use of thermionic valves before sale
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