ป้ายถนน, โรงงาน, สัมมนา, งาน, บันทึก, ธุรกิจ, ความร่วมมือ, การทำงานเป็นทีม, การอบรม, ข้อมูล
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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