Rectangular holes punched from cards [was RE: Display-less computing]

Rich Alderson RichA at
Tue Dec 15 13:30:17 CST 2015

From: Fred Cisin
Sent: Tuesday, December 15, 2015 9:12 AM

> My father claimed that the use of round holes on divergent cards was due 
> to an attempt by IBM to patent the shape of the hole in the cards.

Prior to 1928, the holes in IBM's cards were round, too.  The use of round
holes by Univac was an avoidance of paying royalties to IBM, which held a
patent on 80-column rectangularly punched cards.


Rich Alderson
Vintage Computing Sr. Systems Engineer
Living Computer Museum
2245 1st Avenue S
Seattle, WA 98134

mailto:RichA at

More information about the cctalk mailing list