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solar energy, engineering working on roof at solar power station, operation and maintenance in solar power plant
It's time for energy saving light bulb, one glowing compact fluorescent light bulb standing out from the unlit incandescent bulbs
Hand turning a productivity knob. Concept for productivity management. Composite image between an photography and a 3D background.
Efficiency Business Concept
business man writing industrial product and service improvement concept of increased quality - speed - efficiency and reduced cost

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