| 摘要 |
A data processing form used with photosensing apparatus that senses the presence of indicia in indicia-receiving locations on the form comprises a sheet of paper or like material. The form has a first control mark column containing a plurality of control marks in specified relation to a plurality of indicia-receiving locations on a first surface of said sheet. On the second surface of the sheet is a fail-safe mark opposite to and aligned with the first control mark column. The fail-safe mark has a continuous extend sufficient to connect at least two adjacent marks on said first surface, were such control marks on the second surface of said sheet in a location immediately opposite their location on said first surface.
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