هترة ع., سلامة ا., & الضاهر ن. (2021). Improving Mechanical Properties (Impact Strength and Wear Resistance) of Drilling Teeth Steel and Breakers Hammersr. Tishreen University Journal -Engineering Sciences Series,, 43(2). Retrieved from http://www.journal.tishreen.edu.sy/index.php/engscnc/article/view/10552