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The ornamental design for a vacuum flask, as shown and described.
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FIG. 1 is a side elevational view of a vacuum flask showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a top plan view thereof; and,
FIG. 5 is a bottom plan view thereof.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Mar 26 2004 | Phoenix Vacuum Flask Co., Ltd. | (assignment on the face of the patent) | ||||
| May 21 2004 | HSIUNG, FRANK HUANG TEH | PHOENIX VACUUM FLASK CO , LTD | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 015399 | 0533 |
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