EVAN A. EVANS, Circuit Judge.
The patent in suit, No. 1,207,711, covers a "changeable signboard," and relates, so the specifications say, to "the particular manner in which the letters or other characters are constructed, so that each will act as a spring to bind against the surface of the board and thus be securely held in position." The single claim reads as follows:
"In changeable sign characters adapted to be used with a board having grooves comprising...
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