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发明名称
Seal
摘要
申请公布号
US1818651(A)
申请公布日期
1931.08.11
申请号
US19270181810
申请日期
1927.04.07
申请人
ROSS OSCAR A
发明人
ROSS OSCAR A.
分类号
F16B41/00
主分类号
F16B41/00
代理机构
代理人
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