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The ornamental design for a flip-up auto darkening welding helmet, as shown and described.
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The broken lines shown in the drawings represent portions of the flip-up auto darkening welding helmet that form no part of the claimed design.
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Feb 22 2017 | WU, ZIQIAN | TECMEN ELECTRONICS CO , LTD | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 042134 | /0311 | |
Mar 10 2017 | Tecmen Electronics Co., Ltd. | (assignment on the face of the patent) | / | |||
Mar 20 2023 | TECMEN ELECTRONICS CO , LTD | TECMEN ELECTRONICS CO , LTD | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 063353 | /0937 |
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