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577,151
having a centrally-perforated boss upon one face and a series of radial grooves extending from the boss to the periphery of the disk, and a rivet passing through the central per- 5 forations and clamping the ends of the rib- wires between the two disks, substantially as described.
In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses. JOHN W. TAYLOR. Witnesses: ED. i. KANE, II. A. McMEANS.