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发明名称
Improvements in methods of and apparatus for making Helically-Seamed Tubes
摘要
申请公布号
GB1168179(A)
申请公布日期
1969.10.22
申请号
GB19670057305
申请日期
1967.12.18
申请人
EINO KALERVO MALKKI;VALENTIN SILDE
发明人
EINO KALERVO MALKKI;VALENTIN SILDE
分类号
B21C37/12;B23K9/032
主分类号
B21C37/12
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代理人
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