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发明名称
Means for preventing draw back marks
摘要
申请公布号
US2673388(A)
申请公布日期
1954.03.30
申请号
US19480037490
申请日期
1948.07.07
申请人
THE NEW BRITAIN MACHINE COMPANY
发明人
RETZ WILLIAM B.
分类号
B23Q1/68
主分类号
B23Q1/68
代理机构
代理人
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