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发明名称
étancon de mine à dégagement par détente télescopique
摘要
申请公布号
FR763500(A)
申请公布日期
1934.05.01
申请号
FRD763500
申请日期
1933.11.06
申请人
MEYERHOFER & CO
发明人
分类号
E21D15/502
主分类号
E21D15/502
代理机构
代理人
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