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MASS production, giving rise to the modern tendency to construct machines particularly adapted for their specific task rather than for general use, has driven mechanized industry towards two solutions: the so‐called “universal” machine tools and specialized machines outside the usual categories.

Under this heading are published regularly abstracts of all Reports and Memoranda of the Aeronautical Research Committee, Reports and Technical Notes of the U.S. National Advisory Committee for Aeronautics and publications of other similar research bodies as issued