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Collage of electrical objects
light bulb
lightbulb
illustration white old fashioned lightbulb with drop shadow
concept bulb drawing
電球
コミック風の電球クリップアート
ひらめきを表す電球
Energy saving lightbulb on top of windmills and nuclear power plant
Lightbulb idea concept flat design and long shadow.
Lightbulb idea concept at flat design and long shadow
Lightbulb idea concept at flat design
白熱電球
Collection of eight brightly coloured light bulbs with shadow
Question mark inside light bulb
電球のピクトグラム
Old style light bulb with metal surround and drop shadow
Illuminated electric light bulb realistic isolated on white background vector illustration
地球の電球
Illustration of light bulb
Lightbulb idea concept with hand at flat design and long shadow