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发明名称
Seal
摘要
申请公布号
US2557835(A)
申请公布日期
1951.06.19
申请号
US19480059065
申请日期
1948.11.09
申请人
MONAHAN JOHN C
发明人
MONAHAN JOHN C.
分类号
F16J9/28
主分类号
F16J9/28
代理机构
代理人
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