Horace Gray, Cadwalader v. Zeh — Opinion of the Court
“ It has long been a settled rule of interpretation of the statutes imposing duties on imports that if words used therein to designate particular kinds or classes of goods have a well-known signification in our trade and commerce, different from their ordinary meaning among the people, the commercial meaning is to prevail, unless congress has clearly manifested a contrary intention, and that it is only when no commercial meaning is called for or proved that the common meaning of the words is to be adopted. ”
