The ornamental design for a body of electric chainblock, as shown and described.
FIG. 1 is a perspective view of a body of electric chain block showing my new design;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a rear view of FIG. 1;
FIG. 4 is a left side view of FIG. 1;
FIG. 5 is a right side view of FIG. 1;
FIG. 6 is a top plan view of FIG. 1; and,
FIG. 7 is a bottom plan view of FIG. 1.
The broken lines in the drawings are for the purpose of illustrating portions of the body of electric chain block that form no part of the claimed design.