Introduction is made to working principles, practical effects, properties and installation 0f tabulator bars.
对扰流棒的工作原理、使用效果、特点以及安装进行了介绍。
A clerk could feed 8000 cards a day through his tabulator, and the Census Office saved months of processing time.
一位办事员每天能将8000张卡片输入制表机。这样就使人口普查办公室节省了几个月的时间。
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