Hollerith key punch, model 20, made by the British Tabulating Machine Company Limited, Letchworth, Hertfordshire, England, 1909-1932.
Key punches were used for punching holes in stiff paper cards. The pattern of the holes recorded data, which could then be read by unit records equipment, early data processing machines. Punched cards were later adapted for use with some of the earliest computers. This key punch was used with 45 column cards.
- Computing & Data Processing
- Object Number:
- punch (cutting tool)
- furnishing and equipment
- tools & equipment
- Donated by Fujitsu Siemens Computers Ltd.
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