FIG. 1 is a perspective view of the third embodiment of a ring-shaped hanging oil lamp;
FIG. 2 is a front elevation view of the third embodiment;
FIG. 3 is a back elevation view of the third embodiment;
FIG. 4 is a left-side elevation view of the third embodiment;
FIG. 5 is a right-side elevation view of the third embodiment;
FIG. 6 is a top plan view of the third embodiment;
FIG. 7 is a bottom plan view of the third embodiment;
FIG. 8 is a perspective view of the fourth embodiment of a ring-shaped hanging oil lamp;
FIG. 9 is a front elevation view of the fourth embodiment;
FIG. 10 is a back elevation view of the fourth embodiment;
FIG. 11 is a left-side elevation view of the fourth embodiment;
FIG. 12 is a right-side elevation view of the fourth embodiment;
FIG. 13 is a top plan view of the fourth embodiment; and,
FIG. 14 is a bottom plan view of the fourth embodiment.
The portions of ring-shaped hanging oil lamp shown in broken lines form no part of the claimed design.