ไม้บรรทัดสามเหลี่ยมอลูมิเนียมอัลลอยด์ 7 นิ้ว ไม้บรรทัดวัดองศาแบบนิ้วและเมตริก เครื่องมือวัดและตรวจสอบความแม่นยำ

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