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DIAGRAM SHOWING FAILURES PER 100 TRACK MILES PER YEAR BY MILLS FOR PERIOD ENDING OCTOBER 31, 1920.
FIG 4. AVERAGE FAILURES CLASSIFIED BY MILLS FOR THE ROLLINGS FROM
1915 To 1919, INCLUSIVE
SUMMARY FROM EIGHT YEARS REPORTS SHOWING TRACK MILES, TOTAL FAILURES AND FAILURES PER 100 TRACK MILES