chadless keypunch การใช้

It suggests the origin came from a machine called the Chadless keypunch that cut holes in a paper card.
It was clear that if the Chadless keypunch didn't make them, then the stuff that other keypunches made had to be chad ."
It was " clear " that if the Chadless keypunch didn't make them, then the stuff that other keypunches made had to be ` chad .'
As for its roots, the Hacker's Dictionary opines that the word comes from the Chadless keypunch ( named for an inventor whose full name I could not find ).
Some believe the work derives from the Chadless keypunch, named for its inventor, which cut little u-shaped tabs in the card to make a hole when the tab folded back, rather than punching out a circle / rectangle.