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The ornamental design for a vacuum flask, as shown and described.
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FIG. 1 is a front elevation view of an example embodiment of a vacuum flask showing my new design.
FIG. 2 is rear elevation view thereof.
FIG. 3 is a left side elevation view thereof.
FIG. 4 is a right side elevation view thereof.
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Oct 17 2005 | Phoenix Vacuum Flask Company, Ltd. | (assignment on the face of the patent) | / | |||
| Dec 22 2005 | HUANG, TEH-HSIUNG | PHOENIX VACUUM FLASK COMPANY, LTD | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 017640 | /0186 |
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