Name/Title
1918- Tabulating Machine Key Operated 45-COLUMN VERIFIER (6/2025)Tags
IBMDescription
Card Punch- 45-Column Verifier. Two-pass verification, also called double data entry, is a data entry quality control method that was originally employed when data records were entered onto sequential column cards with a keypunch. In the first pass through a set of records, the data keystrokes were entered onto each card as the data entry operator typed them. On the second pass through the batch, an operator at a separate machine, called a verifier, entered the same data. The verifier compared the second operator's keystrokes with the contents of the original card. If there were no differences, a verification notch was punched on the right edge of the card. Until 1928, the standard punch card used had 45-columns with round holes. 80 column cards with rectangular holes became the industry standard in 1928 and IBM converted nearly all 45-column machines to 80-column machines at this time.Acquisition
Acquisition Method
EBayDate
Jun 1025General Notes
Note
c1918-1924 Verifier computer, which was never converted over to 80-column, as it is still configured for a 45-column card with round holes. This is a very rare example and dates to pre 1924, before the IBM name was introduced! On the side is the original brass tag which reads “The Tabulating Machine Co. New York City Patented May 21 1918.” … This rare and early Data Entry Tabulating Computer is in original, complete condition including all its hard rubber buttons, and is in working condition. All the buttons press and the chassis moves and returns smooth and easy, however there is damage to the rubber buttons. On the plate it is engraved with the number “11-25 V- 108703” and on the moving brass arm it is written in black paint or marker 438.