4. Electric lamp and discharge devices
  5. With optical device or special ray transmissive envelope
  6. Light diffusing
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Electrostatic coating of silica powders on incandescent bulbs

Electric lamp and discharge devices – With optical device or special ray transmissive envelope – Light diffusing
Patent

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Electrostatic silica coating for electric lamps

Electric lamp and discharge devices – With optical device or special ray transmissive envelope – Light diffusing
Patent

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