กระเปาะ, ไฟ, แถว, หลอดไฟฟ้า, พลังงาน, ไฟฟ้า, การประดิษฐ์, ใย, เรืองแสง, ความคิด, สีดำ
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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