4. Electric lamp and discharge devices
  5. With gas or vapor
  6. Envelope with particular structure
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High-pressure sodium discharge lamp

Electric lamp and discharge devices – With gas or vapor – Envelope with particular structure
Patent

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High-pressure sodium discharge lamp with fins radially extending

Electric lamp and discharge devices – With gas or vapor – Envelope with particular structure
Patent

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Horizontal burning metal halide lamp

Electric lamp and discharge devices – With gas or vapor – Envelope with particular structure
Patent

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