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330mesh carbon black powder grinding mill ygm160 q4 1.5 2 ton hour

for the school year was 1,963.2-1,322.9 in the white schools and 640.2in the colored schools; compared with 1,709.2-1,212.2, and 495.6, re-spectively, for the previous year. The regular physical examination of pupils was made, resulting in the.treatment of 679 pupils for defects discovered, consisting in the largest proportion of defective teeth.

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