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The ornamental design for a handheld vacuum pumping device, substantially as shown and described.
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Features shown in broken lines in the drawings form no part of the claimed design.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Jan 10 2017 | CHAO, TA-CHING | BIG GOOD DESIGN CO , LTD | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 040952 | /0312 | |
| Jan 11 2017 | Big Good Design Co., Ltd. | (assignment on the face of the patent) | / |
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