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经营范围
发明名称
Improvements in means for drying and/or preventing freezing of relatively large areas of ground
摘要
申请公布号
GB631291(A)
申请公布日期
1949.10.31
申请号
GB19470024384
申请日期
1947.09.04
申请人
EDWIN KNOTT
发明人
分类号
A01G25/06;E01C11/26;E01C13/08;F24D3/14
主分类号
A01G25/06
代理机构
代理人
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地址
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