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provided at suitable points with upward-projecting spurs which are partly cut from and form part of the same, in combination with cement or other like material applied in a plastic or semi-liquid state to and caused to cover the surface of said plate, substantially as and for the purposes set forth.     In testimony that I claim the foregoing I have hereunto set my hand this 4th day of February, A.D. 1884.
CHAS. E. FURMAN.
Witnesses:
    R. S. HAYWARD,
    E. P. GLEASON.