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发明名称
Envelope construction
摘要
申请公布号
US2983485(A)
申请公布日期
1961.05.09
申请号
US19580743892
申请日期
1958.06.23
申请人
THE AIR PREHEATER CORPORATION
发明人
PETERSON DAVID G.
分类号
F28D9/00
主分类号
F28D9/00
代理机构
代理人
主权项
地址
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