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发明名称
Expansible closure means for conduits
摘要
申请公布号
US2279257(A)
申请公布日期
1942.04.07
申请号
US19410378381
申请日期
1941.02.11
申请人
CHARLES W. SIEVERT
发明人
SVIRSKY BENNETT
分类号
F16K7/10
主分类号
F16K7/10
代理机构
代理人
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地址
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