A type of solid-font line printer, first marketed in 1955 but now obsolete. The font was etched or engraved on the outer surface of a cylinder—known as the drum (or barrel)—that extended across the full width of the line to be printed.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。