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发明名称
Verfahren zum Verhindern von Bodensenkungen oberhalb von unterirdischen Hohlraeumen
摘要
申请公布号
DE1299586(B)
申请公布日期
1969.07.24
申请号
DE1964P035083
申请日期
1964.09.17
申请人
PPG INDUSTRIES INC.
发明人
RICHARD POLHAMUS, JOHN
分类号
E21F15/00
主分类号
E21F15/00
代理机构
代理人
主权项
地址
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