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like material, substantially as and for the purpose shown.
    3. An illuminating-tile which is composed of a base having circular light-openings and a superimposed body that is formed by annular intersecting rings, which constitute curbs for the light-openings, and are each adapted to receive and contain a lens, substantially as and for the purpose set forth.
    4. An illuminating-tile which is provided with round light-openings that are surrounded by annular intersecting curbs, and between 		such curbs is provided with recesses, in combination with lenses which are secured within said curbs, and with a cement, glass, or tile filling for said recesses, substantially as and for the purpose shown and described.
    In testimony that I claim the foregoing I have hereunto set my hand this 21st day of May, A.D. 1887.
JOHN W. MARK.
Witnesses:
    WILLIAM ACKERMANN,
    L. A. GIEGENIG.