ความคิด, ข้อเสนอ, หลอดไฟฟ้า, แนวคิด, หญิง, มือ, สมุดบันทึก, จินตนาการ, แรงบันดาลใจ, ความคิดสร้างสรรค์, ความคิดริเริ่ม
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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