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发明名称
Center bearing
摘要
申请公布号
US1770982(A)
申请公布日期
1930.07.22
申请号
US19280245102
申请日期
1928.01.07
申请人
JACOBS DAVID B
发明人
JACOBS DAVID B.
分类号
B61F5/16
主分类号
B61F5/16
代理机构
代理人
主权项
地址
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