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น้อยผล อ, มณีรัตน์ น. Metal Classifying Machine Using Ultrasonic Testing Method. Eng. & Technol. Horiz. [Internet]. 2020 Jun. 22 [cited 2024 May 19];34(2):16-22. Available from: https://ph01.tci-thaijo.org/index.php/lej/article/view/241416