หลอดไฟฟ้า, เบา, ความคิด, พลังงาน, มยูข, หลอดไฟ, การประดิษฐ์, ส่องแสง, การศึกษา, เรียน, ความรู้
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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