ALSCHULER, Circuit Judge.
This litigation involves validity and infringement of reissue patent to Hart, No. 16,374, July 6, 1926, of original No. 1,522,624, January 13, 1925. The specification states: "The present invention relates to dump cars, more particularly of the type known as ballast cars, and has for its object to provide a simple, economical, and efficient car by means of which ballast may be deposited either between the rails or outside of the rails, or...
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