非能动双罐交替工作装置是一种新型的双罐交替工作装置，是曾祥炜研究员的个人发明。
The none-motile alternately working two-pot device is a new type of the alternately working one, which is the individual invents of researcher Zeng Xiangwei.
双祥鹤一直致力于专业工具袋的设计、开发生产与销售。
We have always focused on the design, improvement, production and marketing of professional tool bags.
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