The ornamental design for an electrocardiographicdevice, as shown and described.
1. Electrocardiographic device
Fig. 1.1 is a top front perspective view of an electrocardiographic device showing our new design; fig. 1.2 is a front view thereof; fig. 1.3 is a rear view thereof; fig. 1.4 is a left side view thereof; fig. 1.5 is a right side view thereof; fig. 1.6 is a top view thereof; fig. 1.7 is a bottom view thereof; and, fig. 1.8 is a top rear perspective view thereof; the shade lines in the figures show a contour, but are not a surface ornamentation.
The portions of the electrocardiographic device shown in broken lines form no part of the claimed design.