4. Electric lamp and discharge devices
  5. Incandescent lamps
  6. Plural filaments or glowers
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Incandescent lamp with an improved filament implementation

Electric lamp and discharge devices – Incandescent lamps – Plural filaments or glowers
Patent

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Incandescent light bulb with multiple filaments providing multip

Electric lamp and discharge devices – Incandescent lamps – Plural filaments or glowers
Patent

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Incandescent multi-filament light bulb

Electric lamp and discharge devices – Incandescent lamps – Plural filaments or glowers
Reexamination Certificate

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