IPC Main Group
G06K 21/00 Information retrieval from punched cards designed for manual use or handling by machine; Apparatus for handling such cards, e.g. marking or correcting
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- PHYSICS
- Class:
- COMPUTING OR CALCULATING; COUNTING
- Subclass:
- GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
Scope Notes
Limiting references: Detection or correction of errors by rescanning patterns Checking correct operation of card-conveying mechanisms Record carriers for use with machines and with at least a part designed to carry digital marking
Related Keywords
punched or slotted cards for INFORMATION retrievalSTORAGE of information on record carriers designed to carry digital markings
4 direct subcodes
Child Classifications
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- G06K 21/02 in which coincidence of markings is sensed mechanically, e.g. by needle
- G06K 21/04 in which coincidence of markings is sensed optically, e.g. peek-a-boo system
- G06K 21/06 Apparatus or tools adapted for slotting or otherwise marking information-retrieval cards
- G06K 21/08 Apparatus or tools for correcting punching or slotting errors