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公开(公告)号:EP3768945A1
公开(公告)日:2021-01-27
申请号:EP19714568.3
申请日:2019-03-21
申请人: Element Six (UK) Limited , De Beers Group Services Proprietary Limited
发明人: LEEMING, Matthew John Ian , KANYANTA, Valentine , SARIDIKMEN, Habib , VERMEULEN, Adriaan
IPC分类号: E21C25/16 , E21C25/18 , E21C35/18