| 分类号 |
B21C23/21;B21C23/32;H01L21/00;H01L21/205;H01L21/30;H01L21/316;H01L21/74;H01L21/76;H01L21/761;H01L21/82;H01L21/8238;H01L23/29;H01L23/522;H01L23/60;H01L23/62;H01L27/00;H01L27/02;H01L27/082;H01L27/088;H01L27/092;H01L29/06;H01L29/76;H01L29/78;H03F3/347;H03K5/02;(IPC1-7):H01L11/14;H01L15/00;H01G13/00 |
主分类号 |
B21C23/21 |
