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经营范围
发明名称
Thermal insulation unit or board
摘要
申请公布号
US2020639(A)
申请公布日期
1935.11.12
申请号
US19320624595
申请日期
1932.07.25
申请人
GRAYSON RALPH V;BALLENGER EDGAR G
发明人
GRAYSON RALPH V.;BALLENGER EDGAR G.
分类号
E04C2/18;E04C2/34;F16L59/02
主分类号
E04C2/18
代理机构
代理人
主权项
地址
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