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The ornamental design for a welding mask, as shown and described. |
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FIG. 1 is a front perspective view of a welding mask showing our new design;
FIG. 2 is a side elevational view thereof, the opposite side view being a mirror image of that shown;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a top plan view thereof; and
FIG. 7 is a rear perspective view thereof.
Fuerthbauer, Rupert, Huesler, Hans
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Jul 05 1988 | FUERTHBAUER, RUPERT | OPTREL AG, WATTWIL, SWITZERLAND, A CORP OF SWITZERLAND | ASSIGNMENT OF ASSIGNORS INTEREST | 004926 | /0710 | |
| Jul 05 1988 | HUESLER, HANS | OPTREL AG, WATTWIL, SWITZERLAND, A CORP OF SWITZERLAND | ASSIGNMENT OF ASSIGNORS INTEREST | 004926 | /0710 | |
| Jul 21 1988 | Optrel AG | (assignment on the face of the patent) | / |
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