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Incandescent light bulb efficiency
11942575 - Incandescent light bulb efficiency
CFL light bulb efficiency
11942574 - CFL light bulb efficiency
LED light bulb efficiency
11942570 - LED light bulb efficiency
CFL light bulb efficiency
11942573 - CFL light bulb efficiency
Incandescent light bulb efficiency
11942577 - Incandescent light bulb efficiency
LED light bulb efficiency
11942581 - LED light bulb efficiency
Used razor, SEM
11921581 - Used razor, SEM
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