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发明名称
Crown block
摘要
申请公布号
US1833172(A)
申请公布日期
1931.11.24
申请号
US19280308520
申请日期
1928.09.26
申请人
MINOR BURT S
发明人
MINOR BURT S.
分类号
B66D3/06
主分类号
B66D3/06
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