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the MCB committee's supervision, to work together to eliminate weaknesses and combine the best features of each, and to freely share (among themselves) any patented features chosen or developed for the new standard. The result was the American Association of Railroads (AAR, successor to the MCB) Standard "D" Coupler of 1916. This was upgraded to the No. 10 Contour in 1918, which largely eliminated the MCB coupler's tendency to jackknife under buffing forces. A stronger version, the AAR type E was adopted

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