Protection method against exhalation of natural gas to earth surface and apparatus for making the same,申请号CZ19990000275-传众专利搜索

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发明名称	Protection method against exhalation of natural gas to earth surface and apparatus for making the same
摘要
申请公布号	CZ9900275(A3)	申请公布日期	2000.09.13
申请号	CZ19990000275	申请日期	1999.01.27
申请人	SCHMIDT KURT ING.	发明人	SCHMIDT KURT ING.
分类号	E21F7/00;(IPC1-7):E21F7/00	主分类号	E21F7/00
代理机构		代理人
主权项
地址

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