HEBEI YUNMAO IMPORT&EXPORT GROUP CO., LTD (THE PEOPLE’S REPUBLIC OF CHINA) GARAM ELECTRONICS CORP. (KOREA) IMPEX HIGH-TECH HmbH (GERMANY) RUSGEMS CO. LTD. Quarzchmelze Ilmenau GmbH KRYSTALY, Hradec Kralove, a.s (CZECH REPUBIC)