ความคิด, กระเปาะ, การประดิษฐ์, ไฟฟ้า, แรงบันดาลใจ, หัว, โคมไฟ, พลังงาน, อำนาจ, สติปัญญา, เปลี่ยว
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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