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发明名称
Closure means for drain tile and the like
摘要
申请公布号
US3363799(A)
申请公布日期
1968.01.16
申请号
US19650462002
申请日期
1965.06.07
申请人
PLASTA PLUG INCORPORATED
发明人
ZURCHER ALLEN K.;LOOMIS ERVIN C.
分类号
E02B11/00;F16L55/11
主分类号
E02B11/00
代理机构
代理人
主权项
地址
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