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经营范围
发明名称
Apparatus and method for improved pipe to manhole sealing
摘要
申请公布号
US4993722(A)
申请公布日期
1991.02.19
申请号
US19890410585
申请日期
1989.09.21
申请人
NPC, INC.
发明人
GUNDY, WILLIAM P.
分类号
E02D29/12;E03F3/04;E03F5/02;E04B1/682;F16J15/46;F16L5/02;F16L17/10;F16L41/08
主分类号
E02D29/12
代理机构
代理人
主权项
地址
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