เกียร์, กระเปาะ, นวัตกรรม, เทคโนโลยี, ความคิด, ความคิดสร้างสรรค์, อำนาจ, หลอดไฟฟ้า, แรงบันดาลใจ
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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