ตัวเลข, เพชรประดับ, คิวอาร์โค้ด, บาร์โค้ด, รหัส, คนงาน, เทคโนโลยี, อุตสาหกรรม, การสแกน, การสื่อสาร, แสดง
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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