4. Electricity: measuring and testing
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Electric bulb short detection apparatus for traffic signal contr

Electricity: measuring and testing – Electric lamp or discharge device – Electric lamp
Patent

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Electrical load disconnection detecting apparatus

Electricity: measuring and testing – Electric lamp or discharge device – Electric lamp
Reexamination Certificate

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Estimated remaining lamp life indicator system

Electricity: measuring and testing – Electric lamp or discharge device – Electric lamp
Reexamination Certificate

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External light tester

Electricity: measuring and testing – Electric lamp or discharge device – Electric lamp
Patent

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