4. Lighting
  5. Light source
  6. Electric light bulb

Mass Technology (H.K.) Ltd.

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4U fluorescent tube

Lighting – Light source – Electric light bulb
Patent

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Cold-end device of a low-pressure mercury vapor discharge lamp

Electric lamp and discharge devices – With gas or vapor – Having a particular total or partial pressure
Reexamination Certificate

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Device for supplying power to at least one bromine tungsten...

Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Periodic-type current and/or voltage regulator in the supply...
Reexamination Certificate

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Electronic ballast circuit for fluorescent lamps which have a hi

Electric lamp and discharge devices: systems – With cathode or cathode heater supply circuit – Pulsating or a.c. supply to the cathode or heater circuit
Patent

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Electronic ballast for a fluorescent lamp

Electric lamp and discharge devices: systems – Current and/or voltage regulation
Reexamination Certificate

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