The tub file was an early random access memory technology in which pre-punched punched cards that contained frequently used information were stored in a file for reuse. Usually such tub files would contain a series of related data — one for each item sold in a store, for example — so that data would be easy to find and reuse.
网络释义
1、敞开文件
... triangular file 三角锉 tub file 敞开文件 tungsten point file 钨锉 ...