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摘要
申请公布号
PL228445(A2)
申请公布日期
1981.10.16
申请号
PL19800228445
申请日期
1980.12.13
申请人
LICKIEWICZ CZESLAW
发明人
LICKIEWICZ CZESLAW
分类号
E21B;(IPC1-7):E21B/
主分类号
E21B
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