บันไดวน, หอยทาก, บันได, ปล่องบันได, ภูมิหลัง, เกลียว, บทคัดย่อ, ออกแบบ, ใกล้ชิด, แบบแผน, รูปร่าง
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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