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发明名称
Enlarging the diameter of hollow metal articles
摘要
申请公布号
US2102099(A)
申请公布日期
1937.12.14
申请号
US19360061152
申请日期
1936.01.28
申请人
TUBUS A. G.
发明人
SINGER FRITZ
分类号
B21C1/24
主分类号
B21C1/24
代理机构
代理人
主权项
地址
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