I claim the ornamental design for a manual spraying machine, as shown and described.
FIG. 1 is a right-rear perspective view of the manual spraying machine;
FIG. 2 is a front view of the manual spraying machine shown in FIG. 1;
FIG. 3 is a rear view of the manual spraying machine shown in FIG. 1;
FIG. 4 is a left side view of the manual spraying machine shown in FIG. 1;
FIG. 5 is a right side view of the manual spraying machine shown in FIG. 1;
FIG. 6 is a top view of the manual spraying machine shown in FIG. 1; and,
FIG. 7 is a bottom view of the manual spraying machine shown in FIG. 1.
The subject matter shown in dashed lines, and any surfaces of the design not shown, including interior surfaces, form no part of the claimed invention.