4. Electric lamp and discharge devices
  5. With gas or vapor
  6. Having electrode of alkali, alkaline or rare earth material
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High pressure arc discharge lamp having barium hafnate impregnat

Electric lamp and discharge devices – With gas or vapor – Having electrode of alkali – alkaline or rare earth material
Patent

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High pressure sodium lamp having improved pressure stability

Electric lamp and discharge devices – With gas or vapor – Having electrode of alkali – alkaline or rare earth material
Patent

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