Zone punches had other uses in processing as well, such as indicating a master record.
2.
The 083 and 084 sorters recognized these multiple digit or multiple zone punches, sorting them to the error pocket.
3.
Signs could be added to a field by "'overpunching "'the least significant digit with a zone punch : 12 for plus and 11 for minus.
4.
The lower ten positions represented ( from top to bottom ) the digits 0 through 9 . The top two positions of a column were called "'zone punches "', 12 ( top ) and 11.
5.
Alphabetic columns have a zone punch in rows 12, 11, or 0, a digit punch in one of the rows 1-9, and can be sorted by passing some or all of the cards through the sorter twice on that column.
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