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Jet pipe cooling channel vertical processing method for liquid rocket engine, involves adopting pressing plates on workbench, and removing end cover of jet pipe that is dismantled to finish vertical processing of jet pipe cooling channel. 专利
申请日期: 2009-01-01, 公开日期: 2009-04-22
作者:  DU F LI H LIU H LIU W TAO Y TIAN X
收藏  |  浏览/下载:3/0  |  提交时间:2019/12/24
Digital anti-fake technique for paper money, involves executing digital anti-fake fluorescence addition and identification, and executing digital anti-fake magnetic safety line addition and identification. 专利
申请日期: 2009-01-01, 公开日期: 2009-06-10
作者:  TAO X LI H ZHAO X LU J
收藏  |  浏览/下载:4/0  |  提交时间:2019/12/24


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