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发明名称
Method of electrically welding pipes
摘要
申请公布号
US1756403(A)
申请公布日期
1930.04.29
申请号
US19290333372
申请日期
1929.01.18
申请人
THOMSON CHARLES M
发明人
THOMSON CHARLES M.
分类号
B23K33/00
主分类号
B23K33/00
代理机构
代理人
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