Method and composition for production of combination line and halftone photoengravings |
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申请号 | US3440048D | 申请日 | 1964-10-12 | 公开(公告)号 | US3440048A | 公开(公告)日 | 1969-04-22 |
申请人 | PRINTING ARTS RESEARCH LAB INC; | 发明人 | MARX WALTER S JR; | ||||
摘要 | |||||||
权利要求 | |||||||
说明书全文 |