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1956-10-11
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1956-10-11
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1958-02-13
Improvements in electric discharge lamps
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1958-03-13
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1957-07-04
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1956-07-26
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1956-10-04
Improvements in or relating to electric discharge tubes having directly heated cathodes
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1956-12-13
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1956-09-06
Improvements in or relating to cold cathode electric discharge tubes
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1957-07-11
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1957-08-08
Improvements relating to metal-vapour electric discharge lamps
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1958-02-13
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1958-03-13
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1957-01-17
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1957-07-04
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1955-07-28
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1956-07-26
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1956-10-04
Improvements in or relating to electric discharge tubes having directly heated cathodes
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1956-12-13
Improvements in or relating to electric lamps
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1958-03-13
Improvements in orrelating to electrical discharge tubes
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1956-09-06
Improvements in or relating to cold cathode electric discharge tubes
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1956-08-02
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1956-08-23
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1957-08-08
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