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发明名称
SELF-STABILIZING PLUMMET
摘要
申请公布号
PL121600(B2)
申请公布日期
1982.05.31
申请号
PL19790213779
申请日期
1979.02.28
申请人
发明人
分类号
E04G21/16;G01C;G01C15/10;(IPC1-7):G01C15/10
主分类号
E04G21/16
代理机构
代理人
主权项
地址
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