Word:

Chadless keypunch

(hardware)Chadless keypunch - A card punch which cut little U-shapes in punched cards, rather than punching out a circle or rectangle. The U's made a hole when folded back.

One of the Jargon File's correspondents believed that the term "chad" derived from the Chadless keypunch. Obviously, if the Chadless keypunch didn't make them, then the stuff that other keypunches made had to be "chad". The assertion that the keypunch was named after its inventor is not supported by any record in US or UK patents or surname references.
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Chabouk
Chace
Chachalaca
chachka
Chack
Chacma
chacma baboon
Chaconne
Chad
chad box
chadar
chaddar
Chadian
Chadian franc
Chadic
Chadic language
-- Chadless keypunch --
chadlock
chador
chaenactis
Chaenomeles
Chaenomeles japonica
Chaenomeles speciosa
Chaenopsis
Chaenopsis ocellata
Chaeronea
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Chaetodipterus faber
chaetodon
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