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发明名称
Screw-down
摘要
申请公布号
US1948804(A)
申请公布日期
1934.02.27
申请号
US19320590132
申请日期
1932.02.01
申请人
SHOVER BARTON R
发明人
SHOVER BARTON R.
分类号
B21B31/20
主分类号
B21B31/20
代理机构
代理人
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