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发明名称
Seal
摘要
申请公布号
US2183004(A)
申请公布日期
1939.12.12
申请号
US19370171718
申请日期
1937.10.29
申请人
BOYD DONALD A
发明人
BOYD DONALD A.
分类号
F16C33/74;F16J15/32
主分类号
F16C33/74
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代理人
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