一种输入装置，它读取或检测穿孔卡上的孔，把以孔的模式表示的数据转换成电信号。
A card punched accidentally or intentionally with holes in excess of the hole patterns of the character set used.
一种输入装置，它读取或检测穿孔卡上的孔，把以孔的模式表示的数据转换成电信号。
A card punched accidentally or intentionally with holes in excess of the hole patterns of the character set used.
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