Wuxi Huarun Shanghua Technology Co., Ltd. Wuxi Huarun Microelectronics Dry Pump Procurement Standard Section 1: Harsh Process Dry Pump Change Announcement Change Announcement Number: WDZBGGG202505190001 The Wuxi Huarun Microelectronics Dry Pump Procurement Standard Section 1: Harsh Process Dry Pump Announcement (Project Number: DZCGXY202505140018) issued by our company on May 14, 2025, has been changed as follows: the pre change time before the type change and the post change time qualification pre-approval deadline will be 10:00:00 on May 19, 2025, and 13:54:48 on May 20, 2025. Except for the above changes, the rest of the original announcement is still valid. Wuxi Huarun Shanghua Technology Co., Ltd. May 19, 2025