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The ornamental design for a spot welding machine, as shown and described. |
FIG. 1 is a top plan, elevational, right hand quartering perspective view of a spot welding machine embodying the present design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a right hand end view thereof; and,
FIG. 7 is a left hand end view thereof.
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