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发明名称
Improvements in or relating to a manhole closing device
摘要
申请公布号
GB376620(A)
申请公布日期
1932.07.14
申请号
GB19310032949
申请日期
1931.11.27
申请人
CHRISTIAAN GERARDUS BLOM;N. V. TANKFABRIEK
发明人
分类号
F16J13/20
主分类号
F16J13/20
代理机构
代理人
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