IBM 521 card punch
E963536
UNEXPLORED
The IBM 521 card punch was an electromechanical unit record machine used to punch, read, and process data on punched cards in early IBM data processing systems.
All labels observed (1)
| Label | Occurrences |
|---|---|
| IBM 521 card punch canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T12035419 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: IBM 521 card punch Context triple: [IBM 604, usedInCombinationWith, IBM 521 card punch]
-
A.
IBM punched card tabulators
IBM punched card tabulators were electromechanical data-processing machines that read, sorted, and summarized information stored on punched cards for business, scientific, and government applications before the advent of modern computers.
-
B.
IBM 650
The IBM 650 was an early, widely used mid-1950s drum-based decimal computer that helped popularize electronic data processing in business and education.
-
C.
International Computers and Tabulators
International Computers and Tabulators was a major British computer manufacturer formed in the late 1950s, known for producing early mainframe and business computers before eventually becoming part of ICL.
-
D.
IBM 2741 terminal
The IBM 2741 terminal was an early computer terminal based on a modified Selectric typewriter mechanism, providing high-quality printed input/output over communication lines before the widespread adoption of screen-based terminals.
-
E.
Mark-8 computer
The Mark-8 computer was an early 1970s do-it-yourself microcomputer kit for hobbyists, notable as one of the first published designs for a home computer.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: IBM 521 card punch Target entity description: The IBM 521 card punch was an electromechanical unit record machine used to punch, read, and process data on punched cards in early IBM data processing systems.
-
A.
IBM punched card tabulators
IBM punched card tabulators were electromechanical data-processing machines that read, sorted, and summarized information stored on punched cards for business, scientific, and government applications before the advent of modern computers.
-
B.
IBM 650
The IBM 650 was an early, widely used mid-1950s drum-based decimal computer that helped popularize electronic data processing in business and education.
-
C.
International Computers and Tabulators
International Computers and Tabulators was a major British computer manufacturer formed in the late 1950s, known for producing early mainframe and business computers before eventually becoming part of ICL.
-
D.
IBM 2741 terminal
The IBM 2741 terminal was an early computer terminal based on a modified Selectric typewriter mechanism, providing high-quality printed input/output over communication lines before the widespread adoption of screen-based terminals.
-
E.
Mark-8 computer
The Mark-8 computer was an early 1970s do-it-yourself microcomputer kit for hobbyists, notable as one of the first published designs for a home computer.
- F. None of above. chosen
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.