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发明名称
Improvements relating to the construction of hollow metal structures
摘要
申请公布号
GB775481(A)
申请公布日期
1957.05.22
申请号
GB19540011636
申请日期
1954.04.22
申请人
LIONEL CHARLES HEAL
发明人
分类号
B21D53/00;B64C3/26
主分类号
B21D53/00
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代理人
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