ดินสอ, กรรไกร, ไม้วัดมุม, เข็มทิศ, ลังนก, โรงเรียน, สามเหลี่ยม, เส้น, ชั้น, ตาราง, กระดาษ
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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