GENEVA, March 29 -- BEIJING GRAND HITEK.CO., LTD. (Room 01, 1st To 2nd Floor, Building 1, No. 1 Kechuang 15th Street, Beijing Economic-Technological Development AreaDaxing District, Beijing 100176), 北京通嘉宏瑞科技有限公司 (中国北京市大兴区北京经济技术开发区科创十五街1号1幢1至2层01) filed a patent application (PCT/CN2025/119558) for "VACUUM PUMP CONTROL METHOD AND APPARATUS BASED ON FREQUENCY CONVERTER, AND DEVICE AND STORAGE MEDIUM" on Sep 08, 2025. With publication no. WO/2026/061275, the details related to the pa...