y as to the difference between tweedledum and twee-dledee has been adjudicated by the Patent Office, and that apatent has been granted for the difference. In 1858 Charles Phelps, of Salem, Mass., obtained a patentfor a letter opener, consisting of a thread placed in the creaseof the envelope, as… … I claim the application to a letter envelope of an openertherefor, said opener to be attached to, and form part of, saidenvelope, and to be attached and operated substantially inthe manner set forth and described. The unsophisticated mind would naturally suppose thatwhether one selects a thread…
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