เกียร์สวิทช์, คันโยก, ไฟฟ้า, แผงไฟฟ้า, เครื่องบด, สวิตซ์, ผูก, กดเพื่อทดสอบ
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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