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Synchroscope
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Treating cabinet
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Electric lamp for producing short wave length radiation
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Electric lamp
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Unitary illuminating device
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Incandescent electric lamp
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Electric discharge lamp
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Discharge controlling means for discharge lamps
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Electric lamp for producing modulated lights
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Electric radiation device
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Discharge lamp for producing modulated light
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Incandescent electric lamp
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Gaseous illuminating device
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US1975499A
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Constant illumination electric lamp
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US2039772A
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Electric radiation device
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US2010772A
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Lamp for producing intermittent light
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Short wave length electric lamp
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US2007921A
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Variable voltage lamp
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US2007927A
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Long wave length radiation device
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Signal lamp
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