Indicia-Controlled Record Perforating Machine, US Patent No. 2741312
Sample pages
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US Patent No. 2,741,312, granted April 10, 1956 to Reynold B. Johnson of IBM, describing a machine that senses Arabic numerals handwritten in conductive ink on a record card and automatically punches holes at the matching index positions. The text covers the background in punched-card transcription, the sensing unit, pneumatic platen and punch control circuits, and the stated objects of the invention. Three sheets of drawings show the mechanical layout, punch-hole positions and dial schematics, and a vacuum-tube and relay wiring diagram. It is not about weaving, though it relates to punched-card data processing.
- Type
- Patent
- Date
- September 18, 1951
- Language
- English
- Pages
- 4
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From Ralph Griswold's Digital Archive, delivered by the University of Arizona.
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