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عفيصه ك. م. .; صبيح م. ي. .; شاهين ش. ش. . A Study on Structural, Mechanical, Speed and Frequency Properties of the Ultrasonic Generated by the Compression Component 〖Co〗_x 〖Ni〗_(1-X) 〖Fe〗_2 O_4 at Ratios X = (0.0, 1.0). TUJ-BA 2020, 42.