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The ornamental design for a tennis ball projector for training purposes, as shown. |
FIG. 1 is a top plan view of a tennis ball projector for training purposes embodying my new design;
FIG. 2 is a front view;
FIG. 3 is a bottom plan view;
FIG. 4 is a left side view;
FIG. 5 is a right side view;
FIG. 6 is a rear view;
FIG. 7 is a perspective view.
Hirabayashi, Tsugio, Nakai, Michio
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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Dec 15 1980 | Sony Corporation | (assignment on the face of the patent) | / |
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