7 Jan 1992 248/349 x. Para 8 ° ea': ° '3'. 4,482,184 11/1984 Mince)' . . a plurality of ball bearings, four equally spaced casters with roller wheels may be

19 Feb 1985 4,482,184 11/1984 Mincey . Y-coordinates; bearing means for twisting or rotating .. bearing means for rotation of said guide frames and.

4,482,184, issued Nov. 13, 1984 to C. D. Mincey, A ball bearing is placed in a socket between the spike and the chair seat. A second embodiment shows the