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Positive column tube
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Positive column lamp
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Gas discharge light
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Discharge tube
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Improvements relating to gaseous electric discharge luminous devices
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Improvements in or relating to electric gaseous discharge tubes
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Improvements in or relating to electric gaseous discharge tubes
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Improvements in or relating to electric gaseous discharge tubes
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Lighting
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Fixture
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Luminescent tube lighting
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Improvements in or relating to luminescent gas discharge tubes
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Improvements in or relating to electric luminous discharge tubes
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Improvements in or relating to luminescent gas discharge tubes
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Improvements in or relating to luminescent gas discharge tubes
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Improvements in or relating to luminescent gas discharge tubes
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Improvements in or relating to luminescent gas discharge tubes
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Improvements in or relating to luminous electric discharge tubes
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