หมุน, ดู, รอบ, เวลา, สี, ตารางเวลา, ชั่วโมง, นาที, วินาที, ผ่าตัด, สหรัฐอเมริกา
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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