The ornamental design for an electronic dartmachine, substantially as shown and described.
FIG. 1 is a perspective view of an electronic dart machine configured in accordance with the present invention;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is another perspective view thereof.
The broken line showing of an electronic dart machine in FIGS. 3-7 is included for the purpose of illustrating portions of the article and forms no part of the claimed design.