FIG. 1 is a perspective view of a power transmission coupling showing my new design;
FIG. 2 is a front view thereof, a back view being a mirror image thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is a cross-sectional view thereof taken along the line VII—VII in FIG. 2;
FIG. 8 is a cross-sectional view thereof taken along the line VIII—VIII in FIG. 2; and,
FIG. 9 is an illustrative longitudinal cross-sectional view showing the power transmission coupling in use, with a drive shaft and a driven shaft being shown in broken lines and forming no part of the claimed design.