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ひらめきを表す電球
light bulb
Energy saving lightbulb on top of windmills and nuclear power plant
lightbulb
illustration white old fashioned lightbulb with drop shadow
concept bulb drawing
Light bulb, artwork
電球
コミック風の電球クリップアート
Light bulb. The concept of idea.
Collage of electrical objects
Robotic equipment, artwork
Genius, conceptual artwork
Question mark inside light bulb
Illustration of light bulb